The mainshaft seal on the T35 is an IH part 143873R91, but once it is removed you should be able to find an equiv. by measurement. All the seals you have mentioned are in removable covers so changing in situ shouldn't offer any probleems. If you make a tool to bolt to the flanges to hold them the rattle gun should be OK. the flange nut needs to be torqued to 200-250 ft/lbs when reassembling. The transfer case seals all have a felt dust shield which faces the outside when installed. This is why they are so wide. A modern synthetic double lipped seal could be used if the original type is not available.
