I just measured the spring leaves, I assume thats what they go by! could be wrong but the 2 -1/2 brackets have the wrong rivet hole pattern and the main hole is too big.
One site I looked at goes into what ring gear diameter it is!! Talk about shit!! -- one wanted to know what axle it was, ( brand/series) --- and I have no clue! lol!

"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."