You can start with a cross match here: RealOEM.com Online BMW Parts Catalog
If it works out you will also find the ratio is different as when your in low gears it will fly but you will lose a few MPH at the top end, I did this years ago with a capri 1300, stuck a 1600 engine in .........not much could touch me off the lights, but I lost about 12mph at top speed.
I would say you should be alright as Ive just put a 740i gearbox in my 735i all I had to change was the rear propshaft coupling at the rear of the box.
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