• 108mm caliper spacing for stock size 320mm rotors
• Fit both SP1 and SP2
• Available in anodized black or machined silver
• Machined silver can be anodized any color by customer
• Additional 5mm spacers (51497-MEL-D20) available for purchase for oversized rotors
• Made 100% in the USA (except Honda spacers) of T6061 billet aluminum. 
• Kit includes two radial brake adapters, fender mounts and four OE spacers.

These use the very common CBR 600/1000RR Radial Tokico caliper that you can find very reasonable on popular auction sites: 

• 2008 + 1000RR monoblocks
• 2009 + 600RR monoblocks
• 2004 + 1000RR regular
• 2005 + 600RR regular

An installation guide: http://www.speedzilla.com/forums/rc51-technical-discussion/54933-radial-brake-adapter-install-how.html