diff --git a/xdsl/dialects/builtin.py b/xdsl/dialects/builtin.py
index efefb47015..01f98a479f 100644
--- a/xdsl/dialects/builtin.py
+++ b/xdsl/dialects/builtin.py
@@ -1031,23 +1031,28 @@ def __init__(self, types: list[Attribute] | ArrayAttr[Attribute]) -> None:
         super().__init__([types])
 
 
+_VectorTypeElement = TypeVar(
+    "_VectorTypeElement", bound=Attribute, covariant=True, default=Attribute
+)
+
+
 @irdl_attr_definition
 class VectorType(
-    Generic[AttributeCovT],
+    Generic[_VectorTypeElement],
     ParametrizedAttribute,
     TypeAttribute,
     ShapedType,
-    ContainerType[AttributeCovT],
+    ContainerType[_VectorTypeElement],
 ):
     name = "vector"
 
     shape: ParameterDef[ArrayAttr[IntAttr]]
-    element_type: ParameterDef[AttributeCovT]
+    element_type: ParameterDef[_VectorTypeElement]
     num_scalable_dims: ParameterDef[IntAttr]
 
     def __init__(
         self,
-        element_type: AttributeCovT,
+        element_type: _VectorTypeElement,
         shape: Iterable[int | IntAttr],
         num_scalable_dims: int | IntAttr = 0,
     ) -> None:
@@ -1067,7 +1072,7 @@ def get_num_scalable_dims(self) -> int:
     def get_shape(self) -> tuple[int, ...]:
         return tuple(i.data for i in self.shape)
 
-    def get_element_type(self) -> AttributeCovT:
+    def get_element_type(self) -> _VectorTypeElement:
         return self.element_type
 
     def verify(self):
@@ -1086,24 +1091,28 @@ def verify(self):
 
 AnyVectorType: TypeAlias = VectorType[Attribute]
 
+_TensorTypeElement = TypeVar(
+    "_TensorTypeElement", bound=Attribute, covariant=True, default=Attribute
+)
+
 
 @irdl_attr_definition
 class TensorType(
-    Generic[AttributeCovT],
+    Generic[_TensorTypeElement],
     ParametrizedAttribute,
     TypeAttribute,
     ShapedType,
-    ContainerType[AttributeCovT],
+    ContainerType[_TensorTypeElement],
 ):
     name = "tensor"
 
     shape: ParameterDef[ArrayAttr[IntAttr]]
-    element_type: ParameterDef[AttributeCovT]
+    element_type: ParameterDef[_TensorTypeElement]
     encoding: ParameterDef[Attribute]
 
     def __init__(
         self,
-        element_type: AttributeCovT,
+        element_type: _TensorTypeElement,
         shape: Iterable[int | IntAttr],
         encoding: Attribute = NoneAttr(),
     ):
@@ -1118,7 +1127,7 @@ def get_num_dims(self) -> int:
     def get_shape(self) -> tuple[int, ...]:
         return tuple(i.data for i in self.shape.data)
 
-    def get_element_type(self) -> AttributeCovT:
+    def get_element_type(self) -> _TensorTypeElement:
         return self.element_type
 
 
@@ -1161,9 +1170,9 @@ class ContainerOf(
 
     def __init__(
         self,
-        elem_constr: AttributeCovT
-        | type[AttributeCovT]
-        | GenericAttrConstraint[AttributeCovT],
+        elem_constr: (
+            AttributeCovT | type[AttributeCovT] | GenericAttrConstraint[AttributeCovT]
+        ),
     ) -> None:
         object.__setattr__(self, "elem_constr", attr_constr_coercion(elem_constr))
 
@@ -1822,7 +1831,7 @@ def print(self, printer: Printer) -> None:
     "_MemRefTypeElement", bound=Attribute, covariant=True, default=Attribute
 )
 _UnrankedMemrefTypeElems = TypeVar(
-    "_UnrankedMemrefTypeElems", bound=Attribute, covariant=True
+    "_UnrankedMemrefTypeElems", bound=Attribute, covariant=True, default=Attribute
 )
 _UnrankedMemrefTypeElemsInit = TypeVar("_UnrankedMemrefTypeElemsInit", bound=Attribute)
 
@@ -1985,9 +1994,9 @@ class TensorOrMemrefOf(
 
     def __init__(
         self,
-        elem_constr: AttributeCovT
-        | type[AttributeCovT]
-        | GenericAttrConstraint[AttributeCovT],
+        elem_constr: (
+            AttributeCovT | type[AttributeCovT] | GenericAttrConstraint[AttributeCovT]
+        ),
     ) -> None:
         object.__setattr__(self, "elem_constr", attr_constr_coercion(elem_constr))
 
diff --git a/xdsl/dialects/mpi.py b/xdsl/dialects/mpi.py
index d06299d5bc..7cadd94d59 100644
--- a/xdsl/dialects/mpi.py
+++ b/xdsl/dialects/mpi.py
@@ -110,7 +110,7 @@ class DataType(ParametrizedAttribute, TypeAttribute):
 
 VectorWrappable = RequestType | StatusType | DataType
 VectorWrappableConstr = base(RequestType) | base(StatusType) | base(DataType)
-_VectorT = TypeVar("_VectorT", bound=VectorWrappable)
+_VectorT = TypeVar("_VectorT", bound=VectorWrappable, default=VectorWrappable)
 
 
 @irdl_attr_definition
diff --git a/xdsl/dialects/stencil.py b/xdsl/dialects/stencil.py
index 77f1a3b61d..bb25a655d9 100644
--- a/xdsl/dialects/stencil.py
+++ b/xdsl/dialects/stencil.py
@@ -370,10 +370,15 @@ def constr(
         return ParamAttrConstraint(cls, (bounds, element_type))
 
 
+_StencilTypeElement = TypeVar(
+    "_StencilTypeElement", bound=Attribute, covariant=True, default=Attribute
+)
+
+
 @irdl_attr_definition
 class FieldType(
-    Generic[_FieldTypeElement],
-    StencilType[_FieldTypeElement],
+    Generic[_StencilTypeElement],
+    StencilType[_StencilTypeElement],
     ParametrizedAttribute,
     TypeAttribute,
 ):
@@ -387,10 +392,15 @@ class FieldType(
     name = "stencil.field"
 
 
+_TempTypeElement = TypeVar(
+    "_TempTypeElement", bound=Attribute, covariant=True, default=Attribute
+)
+
+
 @irdl_attr_definition
 class TempType(
-    Generic[_FieldTypeElement],
-    StencilType[_FieldTypeElement],
+    Generic[_TempTypeElement],
+    StencilType[_TempTypeElement],
     ParametrizedAttribute,
     TypeAttribute,
 ):