Oil filter adaptor gaskets?
https://www.detroitmuscletechnologi...l-filter-adapter-gasket-set-package-p5249320/
Most newer headers can run without the adapter, as long as your engine has the oil filter plate on it; but you may be limited to using the short filter.
The adapter was mostly for clearance with some exhaust manifolds, although it does help with filter access with some headers.
https://www.detroitmuscletechnologi...l-filter-adapter-gasket-set-package-p5249320/
Most newer headers can run without the adapter, as long as your engine has the oil filter plate on it; but you may be limited to using the short filter.
The adapter was mostly for clearance with some exhaust manifolds, although it does help with filter access with some headers.