"Re: 47-53 Suburban rear seat bolts and clamps" (in the title; but, not mentioned in the message-body)
As Cletis posted, they were carriage bolts. They were not a high-domed carriage bolts, but they were not an elevator bolt. A regular carriage bolt (standard hardware) will work.
A wing nut was used (standard hardware will work), and there was a special washer/clamp/spacer that was curved to fit the seat-frame-base tube. That washer/clamp/spacer had a flat surface on the top (these are not standard hardware).
pictures (and a little text) are worth a thousand words (sorry about the blurry close-up focus)
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You might have to arrange for someone to send you a sample, so that you can fabricate the washer/clamp/spacer. You would then HAVE TO return the sample-part to the sender.
