I’ve been fussing over this series of lamps and mounts from various manufactures. There is a similar smaller size but the lamps don’t just snap-in like with this size, thus I decided to keep my focus on this size. I’ve tried Optronics lamps, and Maxxima lamps, which both fit this mount. I purchased an Optronics mount also and the Grote mount is so much better built, the plastic looks like it is twice as thick, the overall fit and finish is much better. This will probably become my go-to standard mount for clearance lights. Note to Grote, I would like to see a clear LED lamp for this mount, to be used for inside cabs etc.