seat belt?

[Porsche9]

I find most plastics that get ugly on these cars either have to be replaced or refinished to look good again. Maybe a good used one from a dismantler?

Pelican Parts has it too.

2002 Porsche Boxster Base Convertible - Seats, Belts & Upholstery - Page 1

[boxxster]

Any sort of vinyl/plastic dressing should make it look better. I use chemical guys vrp but something like back to black would work too.