On springs...my trucks springs are in good shape, however after installing new Jim Carter covers last summer I'm not a fan of the stock seat springs. If on a longer than two hour drive, the old backside is not happy at all.
Now this could be my fault I admit. When I researched diy upholstery I saw several folks used hardware cloth (1/2") and carpet to cover the springs. My thinking in doing same is it'd unitize the springs, preventing sags/low spots as I made the truck a daily driver. Well, mission accomplished, and on shortish drives the seat is fine. But long dives, not so much.
Since your springs are already compromised, my recommendation is to consider ditching them and go to a plywood/firm foam seat. Some good how-to articles on line. I do believe on this forum.
Good Luck, Ron
