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The M Frame is universal to all of the appropriate lenses. If you have an older generation of frames I would not suggest a new lens as the size variations over the years can leave you with a combination that may crack the older frames. First generation frames likely won't fit, second generation may be tight and can easily result in a cracked frame.
If you post photos of what you've got I can tell you what it is. If you take a picture of it on your face I can try and suggest a lens size that might suit you better.
The current lens sizes in decreasing size are; Heater, Agro (3.0), Strike, Hybrid, Sweep, Hybrid S. There have also been Slash, a previous version of Hybrid, V, 67, and Strip lens sizes that were sold with the 1st and 2nd generation of M Frames.
I know the lens has attaching tabs on the Heater lens. Not sure of other lens fitting this frame.