diff dimensions
 

I'm building a 7 style kit car using mx5 running gear. I have a 7 inch open diff in the rear. My budget doesn't allow a torsen at this stage but I'd like to put one in at a later date. I need to get bespoke driveshafts made to length for this project. Will I be able to plug the stub shafts from the open diff straight into a torsen and are the dimensions identical? Btw I have the cv joint style stub shafts not the flange and I think torsen uses flange? Not sure if compatible

Torsen pumpkin vs non-torsen pumpkin is a bolt in swap. Identical dimensions

In the 7" rears all the axles are the same besides MSM. Its just that 94 and some of 95 had flanged sub shafts. Pop out the stub shafts and the 96+ axles will go right in.