Glenn - Just my $.02 worth, but the seats you have are going to need a lot of repairs. Not just replacement of a few springs. The amount of time and effort might be better spent locating better seat pieces. They are frequently offered for sale in various want ads, with conditions ranging from restored to at least solid spring assemblies ready to be recovered.
Unless you really want to go the hard route, try putting an ad up in
Truck Parts Wanted.
We'd be glad to try and help you locate some if you like.
