which is the right set of KMC missing chain links to get for a typical SSFG? all of them say stuff about being appropriate for 6- or 7- or whatever, so I'm not sure which size (6.6mm? 7.1mm? 7.4mm?) i saw only one site that the 7.4 was supposed to be appropriate, my current chain is a KMC but I don't know what size exactly. and it shouldn't matter 1/8" vs 3/32" right?