Those slots are 12 mm long? I was think'n they were for the std 1.5x6 mm size, but from the pics, they have to be longer than 6 certainly, so probably the 12 mm size you ordered.
Not without grinding. Best I can tell the slots are 2.25mm in width. Seems they intended the slots to fit 2x10mm but the 2x12mm is more common at our usual oversea’s stores.
The bezel is not glued. Came off easily. The part of the head above the ring has a touch of loctite or something on it but, it was still pretty easy to get off. I just wrapped some tape around it and used some channel locks and it twisted right off. You can swap the emitter by just removing the bezel but, you gain some extra working room if you get that part above the ring off.
Hmm, the seller says “pre-order, shipping starts march 15”, and on top of that the site does not like the code: “can not used anymore today”.
So for me at least the deal is not very alive.