E36 diff and axles

[7ishNZ]

Has anyone used the e36 diff and axles in the roadster? Did you have to shorten the axles, or did you change the rear track?

I have a 2006 R1 engine, so am after a diff ratio below 3.5. The bmw has a good range of ratios and LSD's available, but I am concerned about how heavy it is.

I am in NZ, so there are almost no sierra's left here, and the 3.14 and 3.38 ratios are like hen's teeth!

Any help would be appreciated.