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GM had an option of a single square head light in 1980 and than went to single or dual square lights in all the 1981 to 87 trucks and 1991 on Blazers & Sub's.
I think the wrap around grill that you are talking about is a 1981/1982 single head light truck where the blinkers are in the bumper just like a 1971/1972 truck had.
HTH , Tom