1300 hp mercury comet brake failure crash

missing linc said

All you need to do is install a set of later model seats, like those from a Sebring Convertible for example, with the shoulder harness built in.

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ill do you one better, get a third row seat from a yukon XL or similar
they have the build in shoulder belts, they are still a bench seat (and if it doesnt have a bench seat its not a muscle car)
AND they fold flat in case you want to take a nap in the back seat

i actually installed one in my bronco years ago, to add a third row to that