You asked for help with aftermarket parts --
IMHO you might do better looking at salvage yard parts -
look in Mike Foke's site for locations
http://mike.focke.googlepages.com/
As a follow up -- did the rear wheel hit a curb, and if so are the transmission or CV joints damaged?
Comment: I would take the car into the porsche dealer for a full damage appraisal before attempting to repair what you think is wrong with the car -- it may be worth the cost. FWIW
Ed