As you're in the US, have a look at the Mercury Merkur XR4, this was the US version of the RWD European Ford Sierra and the rear IRS has been adapted to fit a variety of smaller cars over here. The XR4x4 is a different beast (4WD) but I doubt that was sold in the US. Fitting any IRS is going to involve some serious re-engineering of the back end, but personnally I'd go for the Ford unit for a 4-pot car & consider the Jag for a V8.
id be suprised if anything fitted of the shelf for a 100e.there not the biggest of cars
so if its got to be narrowed id go for a late 80,s thunderbird irs.
they came with an 8.8 diff so plenty of gearing available and the supercoupe had an lsd fitted.
if you manage to find two can you send one to the uk for me.
Without knowing what you are trying to build or what power you'll be putting through it...a slightly left field suggestion - Triumph Spitfire as a basis and convert to coil over shocks? Might be narrow enough but wouldn't want to put more than 150b.h.p. through one for long (I've run a 150b.h.p. TR6 lump through one). A late 1500 Spitfire (3.63:1) is the strongest, the earlier the car, the weaker and lower geared it will be. I know we sent more Spitfires to the States than we kept over here but it's up to you to find one.
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