indicator lenses are at Berrys, think they have cheap ones and good. both fit, cheap ones fade in a couple of years. gcp.se have the lenses, genuine and brilliant.
Berry's may also have mirrors though asking here will likely find you some.
cannot help with the carb, there is a complete carb b21 in the workshop with a 4 speed behind it looking for a home, though you are a long way away.
