You can get the factory "graphite" carpet sets from the dealer. The loop design carpets are extremely durable. I'm amazed at how well mine have held up considering the age and climate use of my car.
Do the dealer carpets come with the padding? I had mine out recently and it was heavy with the OEM padding.
The best place to check out carpet, etc., is a good trim shop. I got almost identical vinyl for the extendable part of the sport seat bottoms. The air holes are a few mm's farther apart. You can't see the difference.
I also agree with the wear properties of the loop carpet. It last's forever. I'll never use cut pile again. It wears especially bad under the pedals.
There's a good weight savings in the padding using more up to date materials. The reason light gray is so common in E30's is that it works so well well with other colors and doesn't show dirt and wear as much.