too many,
All the 73-87 tailgates on the fleet side beds are interchangable. Only differences are the latches and the option to bolt up a aluminum trim in the center portion. A new GM tailgate is very expensive. An aftermarket starts at about $89.00. A GM original will be thicker and stronger than an aftermarket. If you can get it for less than say $100 for an original new GM I would get it.
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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"