I want to upgrade the front brake caliper on my SM. I'm happy to stay with the stock brake disk, but want to get a 4-piston caliper (and I guess a new master cylinder, if necessary to work with the new caliper). I see a bunch of options on Motostrano, but they all seem to fit just the S/E models, and not the SM. Apparently QTM used to sell a Brembo brake caliper that would work, but it looks like now QTM only sells Harley parts. So what would be my options here? Are there any brake kits for the SM that replace the stock brake caliper? I see kits that include a larger disk and relocate the stock caliper, but that seems kinda pointless with the stock sliding-pin caliper.