Thanx Stretch/brian s, its making a lot more sense to me now and after looking at kaszal's Pro-cat the rh pulley has deffo gotta be for a Topcat/Cougar.
As stated the outer width of the pulley is 12mm and with a width of 8.5mm between the raised teeth the 8mm wide Cougar belt ive dug out fits inside a treat. Tho what i didnt realize is that these MMS items have a very slightly different tooth pitch to the Schumachers
Heres a pic of kaszal's (Sorry i didnt ask for permission, so i hope you dont mind me using it kaszal)
http://i103.photobucket.com/albums/m...s/IMG_9065.jpg