best place to purchase carpet

From Rock auto's site:
ACC 11182232 Loop; Molded; Complete; 2 Pieces; With Mass Backing; Click INFO to view full-size color swatches in the image box Info
2 Door; Hardtop; Convertible; 4 Speed

They show LOOP Carpet 80/20 rayon/nylon
and "ESSEX" PLUSH or PILE Carpet which is 100% nylon
The Essex is more expensive