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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2012 Posts: 256 Haunting the SBP since 2001 | | Haunting the SBP since 2001 Joined: Nov 2012 Posts: 256 | Without seeing the part # on the box it's hard to decode....From what I can see of the lamp itself it is a "Guide" unit.
From what I know....the Guide S-18 lamps were mainly used on the car models & the Unity "approved" lamps were offered on the trucks.
However....Both the Guide & Unity lamps are pictured in several different publications as accessories for the trucks.
I don't know enough about the part numbers to tell if a lamp kit offered by GM was actually a Guide or a Unity lamp.
I have installed the Guide S-16 lamps on a few of my trucks, they fit fine & they appear to be a higher quality lamp than the Unity model.
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