Only used on the 123, 105 & 125
IH-394063-r1
Does not show up at all on the CCC parts lookup site.
It seems they scrubbed a lot of those old NLA #'s from their # search system.
Frustrating to say the least and it's only going to get worse like Digger has been telling us.
I dove into my hard copy TC-113 (ser#'s below 400,000) from 10/77 to come up w/that gem of info.
If you are serious about this hobby, best be on the lookout for the old parts books at flea markets and swap meets