13/16 or 7/8 master cylinder repair kits

82 Mazda B2000 pickup.....7/8 or 13/16 bore master cylinder...no one seems to make a repair kit for it? I see an old NOS Niehoff K-1336 kit on Ebay but its over half the price (26 shipped) of a reman (39 local no shipping) and its a 13/16 but other say mine's a 7/8 bore. Most are over $68 new even on Rock. Will have to remove and measure. It looks like a flute...remote reservoir style..like a Neon..Hmmm?