Are these compatible across groupsets? I need some for my Ultegra mech, but crc only have the top pulley in stock. Can I buy one for an earlier (9 speed) mech? Or a 105 set? Or should I just get a new mech, since you don't seem to save much?

How about a set of these or these

have had kcnc's on my mtb for 18 months now, and had no problems,
clee cycles are first class for customer service too! cant recommend them highly enough!

This kit includes jockey wheels
http://www.scottoiler.com/pc/Bicycle_Oiler/Scottoiler_Cycle_Oiler_(Active_Fluid_System).html