It"s been too long for that. But rest assured most motorcycle rear master cylinders can be easily adapted, just look for the right bore size. I ordered a Brembo one that looked right and it damn near fell into place.
If you want something that literally bolts on, maybe Chickenstripn can help with a part number?
That sounds about right. ^^^ Thanks for the heads up
The smaller MC bore does the same exact thing a larger caliper piston would do. You get more pedal travel and more pressure, IMO both good things for the Buell rear brake. You could get a bigger caliper, or change the pedal ratio for the same result, but the M/C change is cheaper and easier IMO.