A ring inside the freehub, Shimano 105 (FH-5501) snapped and the base
separated from the body. Interesting ride home wondering what that
wobble was, along with the chain flopping about while freewheeling.

I'm trying to avoid having to lace in a new hub by replacing just the
freehub body. I only had one Shimano hub in the parts bin and it came
off of a mountain bike. It looks wider. Is it correct to assume that
the mountain hub that I tried is probably 135mm, too wide for an old
12 speed alloy frame, but that a 130mm freehub body from that era
would be a suitable replacement?

-thanx