I've got for sale a pair of headlights from my old 2010 Prius. Passenger side is OEM, unmodified. Driver side is an aftermarket, with version 1 of the TRS quik-retro projector inside it. It has a busted alignment screw, but I have a spare screw for it. Version 1 of the quik-retro works fine, but cosmetically, the projector isn't centered in the shroud when the headlight is re-assembled. AFAIK, they have updated it since then and fixed that problem - you should be able to call them and get a new bracket if you choose. I also have the original projector from that retro'd headlight, if you would like to convert it back. I was thinking $225, shipping & insurance included. Please PM me or use the "email user" link on here to reach me.
Yes, only one headlight has the TRS conversion done. They will sell a single bracket & projector if called and asked. I bought a single side, to replace the driver side headlight after I busted the alignment screw in it. The passenger headlight would still need a TRS kit, or the driver side could be converted back to factory (I believe I still have all the original equipment - projector itself, I have 2).