yeah those guys run a small shop called precisionporsche.com
I picked up my gt3 MK2 side skirting from them. Good price $430 delivered but it was fiberglass and not polyurethane so it was an ok price as far as fiberglass goes.
It took them a long time to make and ship, almost two months. I'm sure they have more business than worker bees after they ran an ad in Excellence.
Gotta be careful with fiberglass its not lazer cut like the factory stuff so the body shop may need a few hours to shape and sand and the fit might not be good.
for front bumpers I would stick with factory parts. Speedster humps, side skirt and rear spoilers...not so risky.