lens

I've had a stone fly up of the rear tire and break the rear light lens, is there an alternative to buying a new complete rear light unit for £150

I've done a cursory search but haven't been able to find a replacement lens for the signals on the mirrors. Have any of you replaced yours with something tinted/smoke color? It's a fairly basic aesthetic upgrade that goes a long way. If you have, I'd appreciate a link to where to get.