OK, I got curious and did some more searching. Found this great thread:
https://forum.ih8mud.com/60-series-wagons/82386-jinkies-fj60-steering-column-u-joint-info.html
Looking at Toyota parts zone, the spider kit for a *J-60 steering shaft is 04371-10011, the same number you posted prior.
Looking at Toyodiy, for a 1975 1200cc Corolla, they list 04371-10011 for the spider kit in the rear driveshaft.
Also looking a Toyodiy, I see that a 1982 HJ-47 lists both part numbers for the PTO shaft, both 04371-10011 and 60020 which tells me they might be interchangable. Can't tell without the picture. Dan may know for sure.
NAPA shows them #PUJ395 for 25 bucks each, worth picking one up and trying it. But if these do fit, then they must be pretty stout if they were rear driveline u-joints for a car application. Toyota parts zone lists a 04371-10011 at 36 bucks, so there is some savings at NAPA.