The Taurus 66 with a 12" barrel was the model used for the 38/357 LBR in Great Britain.
Shipping firearm parts out of the USA is tricky. I'm not sure if scope rails can be legally shipped out of the USA without proper export permits. Perhaps someone with more knowledge can chime in.
There is another option. If you have a access a 3-D printer you can make your own Taurus 66 scope mount: https://www.thingiverse.com/thing:2639390