diff ? need some advice

[CASTRO]

i will soon be putting in on my 96 ti a 95 M3 engine,5spd tranny and front complete suspension. my question is about LSD what should i be looking for i don't want to loose top speed would a 3.23 LSD from a 00 MZ3coupe work for me and is this a good deal this is what the seller sent me:

FS: OEM MZ3 3.23 LSD - Only 27k mi

• LOW LOW mileage on an OEM LSD
• Out of my 00 MC (yes, My 00 MC only has 27k on it)
• OEM 25% lock up
• Perfectly operational; no leaks, noises, etc
• Does NOT include finned diff cover, but will have an E30 diff cover
• It will be carefully and thoroughly packaged

would i have to locate other parts for this to work ?
$400 shipped a good deal or pass ?

how much more would i have to pay for complete rear for the M Z3 coupe