Hello Bryan.
I have a Serek oil cooler from a F1 i had yonks ago.
But i have lost the bolt adaptor that hold the sandwich plate in place. So i have had one made.
But when the filter bolt is tightened, the filter housing is 10mm of the plate. I cannot make the female thread any deeper,
But i can shorten the thread on the bolt.
This is why i asked about bolt lengths.
Sean.