I converted my reflectors yesterday. It was fairly easy and if you don't include the time to run to home depot twice (broke the terminal off one of the lights) and the trip to radio shack, it can be accomplished quickly. I couldn't find a socket for the MR11 bulbs at home depot or radio shack, but I would think they would be available at a lighting store. That is the way to go as it simplifies the job. I tried soldering the wire directly to the terminals, but they don't take solder well. At radio shack I purchased some insulated telephone butt connectors (64-3073). Butt connectors remind me of the service I used to receive from Qwest, but that's another story. Anyway the telephone butt connectors when crimped slightly fit tightly on the bulb terminals. Prying just a bit on the other end of the connector allows you to solder the wire to it. If I were to do it again, I would definitely try to get the correct socket. It would be a cleaner installation.
The 10 watt bulb is very bright. There is no need to go to a higher wattage. Since this bulb is a single filament, it can only serve one purpose, either (turn/brake) or tail but not both. As my car is an early BJ8 (only one tail/brake/turn light per side), I think this idea is a great safety asset, but still allows the car to look original.
I want to check my car's wiring diagram to make sure that the turn/brake lights are fused. Don't remember. I know I added fuses to the lighting switches so maybe that covered it, but will have to dig out my diagram and check.