gonzilla

I have some like that too lying around in a drawer somewhere. When I got the car many years ago I thought they might have been some rare factory option. Nope, they were just old faded center caps, exactly like yours.

Railmaster.

Better still! Every time a Porsche crest falls from a key You may wish something!

abiazis

As long as you have a key head with a working light the color of the crest doesn't matter)

pp000830

Lots of variations on a theme, color, black monochrome, silver monochrome etc:
Offerings on eBay

The Brewmeister

My original keys were the switchblades with no crests. The remote buttons were collapsed and the things felt like they were going to twist apart in your hands whenever you started the car. I converted both to separate fobs and lighted heads with colored crests.