No problem, and that's not slow at all! I wasn't very clear in my email to my friends because we had been talking about it. The x/y numbers represent the bore sizes for the pistons, on each side of the caliper. Often times (like in 6-piston calipers), you'll notice the pistons are different sizes from top to bottom on each side of the caliper. It should be noted though that they will be mirrored exactly from side to side e.g. if on the left side of a 4-piston caliper the top bore is 40mm and the bottom is 38mm, so will it be on the right side.Thanks brother--this is very interesting proposal that I've not thought about! Two questions if you have time. Call me slow but, I don't understand the size listing of x/y? Is one bore size and other caliber size? Second, any ideas on rear wheel calipers? Thanksl!!