Sorry, I should have been more clear. Performance has SOME of their products on their web site. If you fill out the online form a catalog of everything specific to your chassis/model is sent to you, and the suspension parts are in the catalog. Or, their toll free number is 1-800-243-1220.
About the only things I order from them are items like P21s wheel cleaner that I can't get from PartsShop, which is less expensive and faster. The catalog is kind of nice though, in that it has exploded line drawings of the various parts on the w124, including the front and rear suspensions!
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E