I have used two carpet kits from JCW. One in a 78 W250 Dodge and the other in a 76 Chevy C30. Both were listed as top of the line molded carpets. Neather one of the fit worth a darn. The one in the C30 we had to use sheet metal screws to get it to fit down into the floor pans. The Dodge carpet kit fit a little better. Not by much.
Go to a auto trim shop or the dealer.