Yeah website is down as i am in transition relocating countries. But still sell on ebay. Are the donors 8.75 curvature? For a wide lens like r1 (and any xmetal cuts preferably) i discourage using other curvature lenses especially if you have long eyelids. It will bother you sooner or later. So...
Yeah for r2 i only use big taco lenses. Same curvature and keeps the "tail" part of the lens to it. And i never tried cutting a different curvature lens for r2. With that tail it will be a double PITA