Yesterday I broke the plastic circular chain guard ring on my Trek 7100. Having a hard time finding a replacement. It's not a critical part functionally, but I'd like to keep the bike in original condition. It identifies as an SR Suntour Chain guard 48T Outer Ring. Checked the local Trek Store --no luck there. Looked on Amazon and eBay, no luck there, although several bike parts dealers show it as out of stock. In a two dimensional screw pattern template, the 4 screws measure 120mm in one direction and 110 mm in the other direction.

GaryL