Originally Posted by Junkman

Have you looked at splicing the springs back together and buying new padding and covers?
There are clips that go around 2 thicknesses of spring. You essentially bridge the broken part with a piece scavenged from another seat.

I've had various seats from other cars installed in my driver MBZ or otherwise and they have sometimes been acceptable but usually are a compromise. Repairing to new is frequently more expensive but ultimately more satisfying.

Originally Posted by ngarover

you can also simply cut 1-1.5" section from an old injector hard line, drill the hole a little bigger and put the broken spring into either end. Use JB weld as glue... https://dieselgiant.com/repairseatspring.htm