Carpet replacement questions

I bought mine from JC Withney several years ago
for my 70 Dart.
I'm just now getting ready to install it.
The original in my car was a 2 piece, the replacement is 1 piece.
The jute padding on the original is about 3/4in thick and heavy,
the replacement carpet jute is about 1/4in and very lightweight.
The new is molded to shape with plenty of extra to be trimmed.
I can get pics if you really need them.