Mounting Standard - Chain guide mounting standards determine its compatibility with your frame. Older frames will use a simpler version known as ISCG. Most new age frames will use ISCG05, however there is adapters made for cross compatibility.
MRP System 3 Mini-Me Alloy (MSRP $143) - Same great taste, less filling. Drop some weight by going alloy. It’s a lot easier than that weird rice-cake, celery, and tofu diet you were thinking about trying.