the classifieds would be the best place to look for used SVT parts. if you find SVT parts at a wrecker around here consider yourself lucky.
CTA Motorsports sells some used parts, not too sure if they have any right now.

95 SE MTX DH UIM, 65mm TB, SC CAI, Quaife, Centerforce, Fidanza, UR Pulley, F/R Strut Braces, Cross Drilled Rotors, S.S. Brake Hoses, 18" Enkei RS5, SVT Engine Mounts+Inserts, MSDS & y-pipe, Trubendz resonated exhaust & MagnaFlow cat