This is kinda a Z ques.

[thatonekid]

If I wanted to put a z32 diff in my Y33 Q45 which one would I need? NA, turbo, r200, r230?

[thatonekid]

This is for a VLSD and shorter gears

[ghoti]

You need the NA diff which is the R200 for shorter gears ( Same gear ratio as the 240sx)
You'll have to change your hubs out for the Z32 NA hubs because you'll have to use the 5bolt axles.
Unless your Q45 is one of those few tat had the 5bolt axles and not the 6bolt ones (Star shape).

[ruddyrid]

You may have found your answer somewhere else(the question is more for a Y33 forum). But it looks like you would probably need an R200.