I think it boils down to that 73-75 Blazers (I had a 74) had a fully removable top. There was no way to attach the shoulder belts to this. Now in 76 (I think) the blazers were partially removable which gave shoulder belts a place to anchor.
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1979 Chevrolet Bonanza Big10 "Tootsie Roll"
1985 Chevrolet Silverado (wife's)
Member of the Southern Bowties Club
"Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson
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