I wouldn't attach it to the fiberglass top. Just watched a roll over video of a 73-to around 75 blazer (not a halfcab version) and it's top disintegrated - not what you want to have happen to one of your seatbelt attachment points!
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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