Engine Block Bolt Size?

I’m in the process of switching over sensors from my B17 over to my B20V and came across a problem. I need to know the size of this bolt in the following picture.

wat block is that? the b20 or b17

b17 of course see the oil cooler? I’ not so sure myself in size but i’ll look at the manual and see if there is anything about that. Isnt that wher the coolant sensor goes and the next one to it is pressure switch? Correct me if i am wrong please.