There is the K-member, control arms, bumpsteer kit, and coilover hardware.  I ogt a _screaming_ deal on these.
Try 
www.griggsracing.com  for pricing.  Actually, watch the classified and at opentracking.com .  They sometimes have some used stuff pop up, and you can save a few bucks.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page