If the gaskets are different, are the block adapters different as well?
Ray
The block side should be larger and will require the blue 70801 gasket, but the oil cooler adapter should have a smaller opening and will work with the larger blue gasket perfectly.
Just like this first pic:
2003-04 Mach 1 Registry Owners Club - View Single Post - Oil Filter Adapter Gasket
As you can see, the blue gasket will be fine with either oil cooler, but DOES require the blue block gasket for it to seal properly against the block itself.