My friend and I seem to have differeing ideas. I say every Blazer/chevy truck from at least 1987 back had the old style, two knob radios. He seems to think most of the 80's came with the big, large square shaped radios. I don't think those came out until 88 or 89. Also, my 87 is a Silverado package, but no pwr windows or door locks. I don't think silverado included these, as they were extra options. He thinks it's a fake silverado becuase all silverado packages came with these options.