Since there's really only one manufacturer of carpet since Trim Parts was sold to ACC, it comes down to best deal and who you like dealing with. I think that Stock Interiors has the best rep and decent prices. Auto Carpet for Car, Truck, Van - Stock Interiors
Honestly, I've only dealt with them once and I was quite happy. YMMV.
I recently used ACC for a recent 66 charger resto and was super happy with the product. I only ordered a trunk mat but the color matched what was replaced 23 years ago, may be a little dark because if the sun fade but it fit in nice. Ill send you a pic
Do you have a picture of the fender tag? It seems like the second from the left would be a match if your original carpets were new. I would hold the pieces up to the plastic and painted trim on the interior and see which one matches the best.