I heard rumor(?) that they may have stopped making them. Now I guess it may be true. Possibly some of the website catalog places still have leftover stock.
If not, gimme some time, but I can sell you my 11,000 mile ones for $150 for all four.
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Darius Rudis
Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page