im using ISR radial with intergrated Resivor. it dosnet have a great capacity but works well i think it was a 17.5mm bore but best thing to do is call this guy he'll tell you exactly what size you need.
http://www.p3unlimited.com/master_cylinders_front.htm#radial
I did send an e-mail but he didn't answer yet
The ISR looks fantastic. Any pics of the RC46 unit ?
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom