T3 or Power Beams 7" Headlights on Late 69 Car

[7TL34]

My '70 Camaro has one original Power Beam on it. It has "Guide" at the bottom. I also have a pair of Power Beams that I picked up at a swap meet, that have the"GM" at the bottom. I seem to remember a posting on some website where the "Guide" ones were assembly line, and the "GM" ones were over the counter replacements. Don't know if that's true or not, but it sounds plausible. Dale