After a week, the drivers side rear lights stopped working. I thought it might be a loose connection from when I fitted the US lights.
Took them off tonight, checked and it turned out to be just a blown bulb. The glass was all milky on the inside, but both the filaments appeared completely intact, so not sure what happened with it.
Anyway, whilst changing the bulb, thought I'd swap the pegs over from the standard rear lights. They fit much better now than with the US pegs.
Looking at buying Eibach lowering springs and fitting them when I do the rear disc conversion. Also looking at getting my old Alpine double-DIN installed too at some point soon.