RS 2600/3100 Front Guards

Due to my brake kit and front wheels widening the front track a bit I am going to have to go the RS type front guards. Does anyone know a reputable supplier? I have a set of regular fibreglass guards which I might just have to get modified. Will have to weigh cost I suppose.

If it works out cheaper to modify my own guards does anyone have some proper measurements for the RS guard flares?