Bill,
I think the fronts are 1.25" Id and rears are 1.0". I put a $6.00 flaps rebuild kit in one of mine without honing it. Seems to work fine. FLAPS may be less for an assy than the machine shop; the part suppliers are way high on wheel cylinders. I found out the hard way I have some sticky pistons on my motorcycle (see my greasy spoon post 4/29) and I have cleaned those up years ago just using a scotch brite. Time to do it again. LOL.
