I covered my packing strips in black leather, came out fine, matches my gearbox dipstick hole cover.
The seat runners were full of carpet fuzz, needed a good cleaning, so these packings should help keep that down.
I screwed them to a pallet so I could run them back and forth while spraying with the cleaner; the eye bolt is a handle.
Nice to have seats that move easily now.
I noticed the seat runners are stamped:
Manufactured by
Hallam, Sleigh
& Cheston
Birmingham
No. 20308-16
Presumably the 16 means they are 16" long.
They started in 1886 in the horse harness trade, switched to auto parts, and are still in business, but now called Widney.