72 bucket seat bracket question

MDuster said
Does anyone have a photograph of what the entire underside of the bucket seat looks like?

I just got the pair of Left and Right Seat Tracks, from PG Classics.

They give you one semi-rigid wire, plus one coil tension spring. But it is not clear to me how these are supposed to be installed?
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Right now there are complete bucket seat set from a 69 in for sale section. Maybe that seller would get pics of underside for you. No harm in asking.
The little cross wire routes different for left and right track applications. One needs that sheet metal extension piece, other doesn't.