Originally Posted by BillGrissom

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.