The rule of thumb is ALWAYS use a new wrist pin bearing, wrist pin and cir-clips, unless the unit is very low hours and you're replacing the cylinder or piston due to a straight gas failure or the unit was crushed by rolling logs or heavy equipment ( or dropped from a truck or a yarding carriage ).
John- Tecomec never tooled up to make kits for the 046/460. Tecomec stopped making kits for Stihl machines in 1993. EMak, which is a division of Tecomec, has tooled up to make cylinder kits for the TS-400 and 460 cut off saws, as well as the 066/660 magnum chainsaw. I think a 460 chainsaw kit is in the works.
The kits for sale on E-bay ( 024, 026, 034, 036 and others ) are original Stihl OEM kits, and are of comparable OEM quality. I don't know where these sellers are getting these kits in such volume, but I've bought three so far and they were all excellent.