Will these fit in an S30? They are for an 84-85 200SX 4.11 ratio. Norm sell things really cheap sometimes 60-80% off.

http://oem-surplus.com/nwp/picpages/38300-76S00.html

Yes it will. I have one and it came with the same pinion flange as a 280Z so it didn't need to have the flange swapped like the later (86 and later as I recall) R200s.