Brake master cylinder

[Gaylord]

Help... I have a 78 Rx7 Fb with 4 pot calipers/discs from a 87/8 Fc. The original m/ cylinder is leaking, can I get rebuild seal kits? I think I might need  the m/cyl from the Fc to get the bore size correct for calipers. I havn\'t driven car yet so can\'t say what it all feels/ works like .Any ideas- suggestions please. Cheers \'Gaylord\'