So...

Am I wrong in coming to the conclusion there are different COGs for SS and for FG?As in, FG COGs dont work on SS, they only work on FG exclusively and vice versa.

More importantly,
I'm looking to pick up a SS COG 17t, and want to ensure I pick up something that'll work for it, properly.

Any suggestions while I'm at it?

As much as seems some of your guys don't dig on conversions, this will be going on my Peugeot conversion I'm currently in the process of building up as a cheaper beater/commuter (less than 6mi).
Picked it up from a fella who did the ghetto SS and just pulled the shifters off and cut the links down to run it from the cassette to the crank.

Thanks guys!