What is the thread size of the oil stud on the block side of most hondas? It is not M20x1.5. The filter side is M20x1.5 (92 d15), but not the block side.

I'm trying to utilize the oil cooler/warmer in a completely different application and I figured the block side threads would be M20x1.5 as well, but I was sorely mistaken when I went to install the cooler/warmer from a 92 VX on a different block (not car related).

Is there a honda that is equipped with an OEM oil cooler/warmer sandwich plate style that has the block side thread of M20x1.5?

I've been able to find a miata cooler, but I think the honda ones look a bit nicer and they have "holes" through the oil stud for what I believe would be greater cool through more contact time with the cooler plates.

Here is one from a GSR, but not sure what the threads are on the block side: https://www.ebay.com/itm/332678382717?ViewItem=&item=332678382717&fromMakeT rack=true

My application has M20x1.5 threads in the block.

I'm also finding them on CBRs as well. An example: https://www.ebay.com/itm/HONDA-CBR90...ss!99022!US!-1