You say:
Seems no one on this forum will talk about it.
Not a fun project but
I'm not too ashamed to talk about trying to save $200-300 on a wimpy good for nothing REPALCEMENT seat.
I've done the following to my own tractor seats, varies with type of seat but if it's someone else's I do not bother. they can take care of their own.
If the plastic cover is still ok and just the foam unglued from the bottom and hangs out when the seat is tilted forward and the back of the seat has the drain hole at the rear portion right where it curves I just use a 1 inch wide nylon strap and go front to rear on the bottom and secure.
If it's the foam backing coming loose all around the seat and the foam cover is still good (useable) I get couple tubes of SHOE GOO from Amazon in black or clear and apply heavy coat around the edges squirting it back between as far as I can then use furniture clamps with wood backing blocks to just hole the foam seat in place for 24 hours. I do not distort the foam cushion when clamping just enough clamp to hold the seat cushion in place.
SHOE GOO pack of 2 $14.96 at Amazon Prime
Tough stuff and will hold if you do your part.
When all is bad I remove all down to metal and clean the metal then I take some foam padding, contact cement, and Indoor/outdoor carpet and re-cover all of the seat cutting the carpet large enough to cover all the seat including the back. I've got some of these seats that are 5 years old and stay outside year round and still A-ok.
Contact cement has got pricy in last couple years but price is starting to slowly come down. It will take at least a 1/2 quart usually. Put the carpet on while the glue is still wet, have trim scissors handy and the carpet glues good to itself at the overlaps, no clamping required just keep working out the wrinkles before the glue grabs permanently. Let dry 24 hours.
Some of the seats that I'm doing cost around $200-300 for replacement.
Lowes sells some nice looking JD Yellow seat covers that will fit over some lawn tractor seats and help to save plus can also be used to cover a glued seat, BUT you have to be careful and get the correct size cover. (one size does not fit all) I've got a Case 448 that I did not want the JD seat cover yeller on my case so I found a Grey cover (lo back type) on-line, but I keep the case covered out of the weather.
When I take in salvage mowers if the seat is good I remove the seat and store inside. Some of the Cub Cadet replacement seats are pricy.
Yes. new replacement lawn tractor seats are pricy and not built to last very very long especially if left exposed to the weather.