I had the full 57MM system fitted to my 999R at the 1,000KM service and I remember talking to the mechanic who explained that it was a very tight fit! See -

http://217.199.188.40/xmb/viewthread...=5883#pid47685

He had to use various spacers and heat resistant washers to get the right clearances so fortunately no problems for me.

Price as quote through Dave's link is right - robbery!!