I do have a solution for you, however Glo-Brite is no longer in business and subsequently their parts are no longer available, unfortunately.
Instead, what you can use instead is the Optronics Clearance or Side Marker Trailer Light - Incandescent # MC68AB.
This light measures 3-1/2" long, 1-2/8" wide, 1" thick, and is made from a durable ABS plastic.
Additionally, we do also have the same light available with a red lens # MC68RB if you ever should need it. Attached are a couple of... view full answer...