How to attach this seat-need some ideas

standup303 said
Need to attach this back rest to the car somehow. It has a decently thick backing behind the upholstery. My first thought was drive a few shallow screws from the trunk, through the metal bracing, into the back of the seat, but even making them as short as possible would have me a bit worried. It does have some decently thick foam though.

Any ideas?

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Just looking at your seats and I'm pretty sure its not stock.

Here's what I would consider doing.

Cut some 3/4 sheet of plywood to fit behind the seats and attach it to the Sheetmetal structure, cover it with upholstery to match the seats where visible on the sides and top.
Cut a window in the plywood and remove the seat backs to expose the seat inner structure. You then would need to make brackets to attach the seat backs to the plywood. All this would be hidden and only accessible from the trunk.

Hope this makes sense..

I think I've been watching too much "Bitchin Rides" LOL !!