[120mm]

Well, the verdict is back from the jury in my head, and the answer is: I am going with a reproduction Salisbury diff.

When I really looked into my own reasoning for doing a) a 289 leaf spring Cobra and b) building from scratch, I realized that it mattered to me that the rear diff should mount just like an original car, and the Salisbury is the most elegant solution for that.

There are three sources for reproduction Salisbury rear diffs that I have discovered. Kirkham, Hawk Cars and Mike McCluskey. The price for these items are somewhat steep, but that is just the cost of building a leaf spring Cobra, imo.

In the end, I live just down the road from Hurricane Motorsports, and if I really wanted a coil spring car using modern adapted parts, I could just buy one of their kits and build it out a lot quicker and cheaper.

Thanks for all the advice; it really helped me discover what I really wanted in my build.

Drew