Clutch weights 616-66

[Flying Dutchman]

Does anyone know what these are exactly?? I'm assuming they are 66 gram but is there anything special about them?
All other Poo weights I have seen say like 10-58, 10-62, etc. They have the same ramp profile as the 10-62's except they are a little wider.
These were in my 03 RMK 700.

 

[Flying Dutchman]

OK, every Polaris dealer I have called has no idea. After googling, the only small reference was Cat. So I called an Arctic Cat dealer and they have weights with these numbers. XXXX-616-66.
They are definitely a 66 gram weight, but where the extra weight is a mystery. They do look similar but we all know what weights do. Not sure why anyone would even do this?? I guess I'll have to start from scratch for fine tuning using POO weights.