Ok here is the way things go as far as I know and unitl soemone takes a tourer model apart I will not be able to tell if the silver motors offered in 06 thru 07 are left overs or not. One way to tell is the clutch the other would be the type of cam blade that is used on the tensioner side.
The Triumph clutch was chaged in 06 I know this because I have a 06 Ckassic model abd it has the newer style clutch plate.
Below are some pictures and what I know of clutches.
firs tthe older style 04-05 clutch pressure plate and lifter piece
old styel pressure plate with needle roller bearing
old style lifter piece
new style lifter piece and roller bearing with new styel lifter piece.
new style lifter piece and roller bearing
2010 changes in the lifter piece which is the head diamter. I believe this was a great move as it reduces the lifter piece from wallering around in the lifter shaft. I also figure it stops some of the lifter rattling people hear int he clutch.
the difference comparison bwteen the two lifter pieces on the new style clutch (newer style on the left.
comparison between the two from the topside
here is a comparison of them in the lifter shaft first the old style 06
now the new style which I beleieve came out in the roadster 2010 anyone take a 09 apart let me know what they find so I can verify.
Clutch fiber comparison between OEM and MTC
the more contact are is the MTC on the left.
I hope this helps