[Danimal]

Yep! I just bought a pair from Gaudin Porsche for $11.59 a piece.

Originally Posted by 78F350

Those are one of the many small parts that you can buy from dealers and various online vendors for under $20 (US). It's not worth my time to sell them used or your money to buy them already aged for 20 years.
Here's a couple part numbers for them: 98633136104 98633136102
Pelican: https://www.pelicanparts.com/More_Info/98633136103.htm?pn=986-331-361-03-M100
ECS: https://www.ecstuning.com/b-genuine-porsche-parts/underbody-engine-bay-air-guide-update-kit/98633136103kt1/