Front Bench Seat Bottom “Firmer”?

My '72 Polara 4-dr. front bench seat bottom needs some additional support. I feel like I'm sitting in the seat instead of on the seat. The car has 19k miles, which I believe is original based on the condition and history. The interior is in excellent original condition also.

1) Can the seat be made firmer without removing the seat cover?
2) If necessary, can the seat back be separated from the seat bottom?
3) I have a '72 Dodge Body Service Manual.
4) I looked at the underside of the seat...

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Author: 72DL41