I've used more ACC than TrimParts, and I don't recall who made the carpet in my Roadrunner (installed it in '88), but:
1. Never had a problem being too narrow or too short; luck?
2. ACC fits an early-B 4-speed hump much better than TP.
3. TP early-B heel pad is more accurate than ACC's but not by a lot.
4. I fuss with laying it out & let it sit for a day or so before the install.
5. Check 3x before my first cut, which is the gas pedal, followed by tunnel-area seat belts.
6. Can't comment on fading, none of my cars have spent that much time outdoors in the sun, I guess.