Welcome Varmint! Do you have the M2 sylte bezel? If you could post a pic it would help. It also depends on the style of collar. To keep things simple, you could just grab a KX4 (they go for around $45 on the MP). Using other drop-ins, although better, could lead to some heat and compatibility issues, etc.. You could get a "P60" stlye drop-in, such as a nail-bender, and a regular bezel. The M2 style bezel tends to trap heat in the compartment and loosen the adhesives if left on for long periods of time. Like I said, to keep it simple, grab a KX4 and call it a day. Hope this helps!