I bought a set of rear sets and mounting plates for my 3c off Wolfgang a long time ago. Incredibly expensive plus the cast mounting plates fitted horribly. The peg mounting holes were miles off having the pegs bolt on way off square, it took crazy work to fix that. I plugged the original holes with timber so I could use a 30mm hole saw to square up where the pegs mounted, it cut a circular groove 5mm deep to nothing showing me how much material I needed to grind away and then I used a 25mm grinding wheel to take that 5mm offset one side of the peg landing point to nothing on the other to square up the peg mounting point to the hole. All the bits cost close to $1000oz and that was years ago. I don't know who made those casting but they were complete crap. It all ended up ok with all that work, I do like the way the pegs pivot smoothly and square now. The rest of the bits were fine.