im still looking for a better seal for the rear idler but this is what i have so far.
the original seals where grease seals and the sealing lips faced out so that excess grease could pass the seal. the only seals i have been able to find are oil seals. i had thought about filling the section with oil instead of grease but it was mentioned that oil seals can be used if you drill four 1/8" holes around the seal, so this is my plan if i don't find a better matching seal.
original 0.81" thick
parker number 15289 LPD ( 5/8" thick)
garlock number 53X2240 ( 1/2" thick)
SKF part number 31316 (7/16" thick)
motion has these and there site has some good info on them ( their prices are high though)
http://www.motionindustries.com http://www.g503.com/forums/viewtopic.php?f=24&t=175452&sid=fd72bad6f68d0389275aa0728a3af25f