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I did it before. I put the quad head lights(88 blazer) in single head light truck(86 c10). But you have to change your radiator support!!!!!!!!!!!!!!!!! Your bottom head light will not have a hole for the aiming screw! and you will never ever get a perfect square for the part that clips into...

all wiring harness are interchangeable on 73-87 Chevys/gmc (88-91 subs, blazers and crew cabs) BUT! cucv harness are different becuase of the black out lights. A civi harness will work in a cucv just wont have black out lights.