A couple issues to bring up. The band you have pictured is for 73-80 trucks like in photo #1. It would be narrower than your gate plus it will have the notch for the truck's tailgate handle.
Photo #2 shows one on an 81 & up K5 Blazer. They don't have the notch like the pick up version.
The only issue I see if you go with an 81 & up band is look at photo #3. There is an extra space between the taillight and the gate on a Suburban that the Blazer doesn't have. I would assume the Suburban gate is a little narrower than a Blazer. You would have to cut this version into 3 pieces.
Photo #4 is a Blazer tailgate and appears to have the same relief detail as the Suburban.
Photo #5 is a band for an 89-91 Blazer with the backing removed.
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