Rear drum to disk

[Kingb]

I am going to do a disk conversion on my 325i (was a 320i). I am getting a 4dr 325i i think it is a mTech car. I will be rebuilding the rear subframe and using SS brake lines before I put it in my car. Is there a better booster and MC that I can use beside the stock one from the parts car? There are plenty of 5 and 7 series in the Junk Yard. What should I use??

[SpecM]

m3 MC, 25mm ID

or use an e28(5) / e24(6) / e23(7) / e32(7) MC

[Kingb]

anything else more common like off a 5 or 7??

[SpecM]

m3 MC, 25mm ID

or use an e28(5) / e24(6) / e23(7) / e32(7) MC

[Kingb]

Booster also or just the MC? I will go grab one from a E28 and put it in my basement for later use.

Is it a bolt in or what would I have to change?