[83GMCK2500]

That is a GMT-400 platform vehicle. Production ran primarily from 1988-1998, though it ran through 2002 in limited configurations. I would suggest posting this in that section of the forum. The year of your Tahoe is less important than the body style.

FWIW, you have the base model or work truck front with H6054 sealed beam lamps, as opposed to composite lamps. Are you keeping the H6054 size or are you converting to the composite? Can you post pictures of what all you do have? There should be a light bucket with two adjusters, a spring, and a retaining ring that holds the bulb in the bucket. If you do not have a wrecking yard hand I would suggest an LMC Truck catalog.