Can anybody tell me what size thread and fitting is on the AU xr8 oil cooler sandwich plate?
Seen after market plates with 3/8npt thread but that seems kind of small

Thanks in advance

Which bit do you mean....the thread sticking out the block is 3/4" UNF.....as for the threads for the in & out fittings, I haven't a clue.
Is it a genuine article or an aftermarket thing ???
Could be either NPT or BSP threads.