rb20det p/s question

[slidewaysrb20]

im new to the 240 scene and just bought an s13 with an rb20det swap. the car doesn't have p/s and i would like to put it back in my car as its my dd. i was just wondering if the r33 p/s pump will fit on the r32 with out any modifications? or if there are any other p/s pumps that are interchangeable from other cars? i'd really appreciate any help or info i could get. thank you