Let me get this right...

[e30this]

If I was to do a 5 lug swap.
I could just swap rear e30 M3 hub on my e30 trailing arms and use e30 M3 calipers and rotors??
For the front I would need e30 M3 hubs, calipers, brackets and rotots?

Nothing more??

Or do the e30 M3 front stuff not bolt to the e30 spindle.??

[bimmer630]

yes for rear, but good luck finding the real M3 parts
no for front, you need the whole strut housing W/hub and bearing

check out Aptyp's thread he goes over all the options for the rear axle. you can also use 750 e32 calipers and modified 318ti brackets if you wanna retain the E30 M3 wheel offset from what people have said

[e30this]

I already found all of the E30 M3 parts. All brand new front and rear hubs with bearings.
So for the front strut housing the spindles that the hubs bolt to are a different size then??

[atomic]

The rears all you need is the e30 m3 drive flanges, e30 m3 brake backing plates, e30 m3 rotors/pads & NLA brake carriers and calipers (although there is a way around this using e36 318ti carriers slightly modified and e32 rear calipers). You will have to replace the bearings since they will be destroyed doing the swap over. So get all associated parts for that.

The fronts you will need e30 m3 strut housings, knuckles, e30 m3 hubs/bearings (or iirc e28 535 or m5 with abs rings swapped out to e30 m3 abs rings, there is a company that makes them) e30 m3 brake backing plates, e30 m3 rotors/pads & NLA front brake carriers and calipers (I'm not sure if there is a way around not having these parts however)

None of the front e30 m3 parts will work on the non m3 parts...