All of the Mopar carpet line is coming from Auto Custom Carpets, ACC. ACC bought out the Trim Parts carpet line several years ago, leaving them as the sole provider unless your looking at something custom sewn.
Most of the vendors has the carpet drop shipped directly from ACC. Usually, the carpet is cut and molded within 24 to 48 hours of the order being received, so that insures that the carpet is fresh and not crammed inside a box for months or years prior to installation.
Pricing can be all over the board, so check around with your preferred vendor. Also make sure to get a shipping quote as it can vary from vendor to vendor, even it is being drop shipped from Anniston, AL.
The mass backing is becoming very popular for those who are looking to drive the cars. It is the same carpet, they just mold a heavy rubber like backing to the carpet and you also get the jute backing as well. It requires a bit more effort to install, but lays out nice and tends to conform to the floor pan better.
The ACC website is thorough and gives a good overview of the various colors and materials available. If you should want to go with a non factory color, click on the "Other Colors Available" tab.
The ACC Senior Accounts Manager is a Mopar guy as is his family with multiple Mopars. They have helped the hobby over the years in refining the carpet kits for correctness and fit.
1970 Plymouth Cuda Auto | Auto Custom Carpets