300zx MC

I'm slowly buying parts for upgrading my brakes to 300zx. As I was looking at the master cylinders, I found that there are various sizes (15/16", 1", 1 15/16") and at least 2 makers (nabco and tokico).
What's the difference and are there any preferences? I have been to various websites and searched google and other forums, but non explain what the differences are. I have the 26mm aluminum front and rear calipers and planning on getting the projectsilvia brake lines.

Any advice is appreciated.
Thanks

why not get the stock one off the 300zx itself, or find out at a dealership.

Thanks for the reply. If I was getting the parts off one car I would get the MC too (along w/the whole ebrake setup which seems to be a pain), but since I'm buying it at different places at different times you're idea won't work grncivicdhr. But I guess I could call the dealership like you suggested...just thought posting here would be better b/c I know many people have done similar upgrades.

if you find out, post back here. i plan on starting the same project in about 2 weeks.