first gen aftermarket parts

these are a few sites that carry performance parts for your first gen probe/mx6.
www.spmotorsports.com has many aftermarket parts made by other manufacturers
www.hyedracyl.com makes a bigger brake kit for 1st gens
www.nopionline.com has many parts made by other manufacturers

As far as body kits go there are a few kits out there but most of them are offering the same kits (except erebuni and razzi) but they are very outdated as far as styling goes).
if anyone wants to ad any sites i may have missed feel free.