what they call perches are the flats places that are welded onto the top of the axle where the srpings ubolt on... the part your talkin about are the overload stops or rests.. at least thats what i call them...those look like ya said..angle iron, the originals were curved where the overloads rode. on something that always carried a heavy load it wasnt unusual to wear out that overload spring..or the stops..... its just friction with no grease... looks like someone "fixed it" im surprised they werent just welded on fixed..... i can look,,, ive got a pair off a 59 one ton that im not gonna use....if you think ya need exact originals....\
oh....and P.S.
one tons are big bolts... hehehe..