So I swapped a B20 into a freinds 94' GS-R. I got the A/C to bolt up by using the GS-R bracket, but the upper PS bracket doesnt fit, and the B20 upper bracket wont fit the gsr pump. So, do I need an LS upper bracket to make the gsr pump work? Cant use the b20 pump because the fitting on the line is different.

 

you need LS one, because when i swapped in my RS it fitted right

 

yes he is correct you need a ls one because the b20 is like a better version of the ls b18 !