Check out AE85 Trueno's, it might be easier to get one of these.
The chassis is identical to an AE86 and they seem to be more common as imports.
You're right about the good old days, I built my first Sprinter with 4agze about 10 years ago and there was literally dozens of lsd axles and AE86 half cuts floating around. I even decided against buying a full TRD Group A Sprinter 'cause it was too expensive at $12000!!
Wish I'd known then what I know now!!