I used the Monroe Formula GP's. They are pretty much a stock-type shock, but so are the springs (rates).
In fact (not to be tooo commercial here), but MY 11,000 mile Formula GP's will be up for sale _real_ soon. I just some new Koni's and coilovers and am about to install them. Mine will be comming off. (let me know in an email...)
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page