I had two broken springs on my seat both right in the corner. I looked for some repair ideas but came up with my own. I found some 1/4" tubing with a 3/16" ID which fit around the spring wire. I cut the spring back so it was just straight sections and I bent up the tube 90 degrees. Then I filled the tube with epoxy and slipped it over the spring wire so that there was about 1" of bond. I jammed a piece of wood in between the top and bottom of the seat to spread them apart while the epoxy cured so when it was removed it was under slight tension. I waited for it to cure and removed the wood. It feels pretty even now. I just thought I'd pass this along if someone else had the same issue.

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I hope it works out well for you.

My only doubt with a lot of the spring repairs I see is that they often get patched with metals/materials that are too rigid and not springy, thus putting more stress on other springs in the seat.

I repaired a seat bottom a couple of years back (haven't used it yet - part of a long term project), but I clamped and wired new springs and repair pieces (cut from identically-shaped springs) in place. In theory, this should allow the springs to flex as intended.

In theory... I'll find out when I can actually drive the car. Again, I hope this works well for you.

I've used JBWeld and compression fittings from the plumbing department. They held for a time. A better repair is swapping in a passenger spring. Even better would be finding a later seat from the same model car. Even better would be 2 late model passenger seats with new panels made for any that are worn.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

This was from the drivers side which I'm switching with the passenger side since I'll mostly be commuting alone.

I did the same, using 1/4" Cu tube ~4 yrs ago on my 85. I don't think it has broken since. Later, I rebuilt my 84's seats. I added extra spring wire since the factory design seemed a bit too soft. I also strung nylon rope across the top to better support the foam (my 85 had horsehair, I recall), w/ plastic carpet protector on top of the springs.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

'85's didn't come from the factory with horsehair IIRC. Sounds strange.

Perhaps I mixed up my 1984 & 1985 300D. I know one had foam and one horsehair. I posted details of the repairs, but can't find the post, nor tell from the photos I filed away. I don't know the history of the cars, but saw no sign that either had been repaired prior. I recall the 1985 had horsehair because I thought, "isn't foam newer and cheaper" and they don't usually go to older methods, though I doubt the horsehair is authentic. Both seat covers were tan M-B plastic fake leather tex material.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans