Courtesy of Kev007, and I guess Sri_Kev aswell I was given a pair of these with one in bits needing re-sealed (other one had already been done):
A royal faff getting the darn thing back together, and then realising I'd left a small white clip out of it in the process - a bit of garden string and some needle-nose pliers later and it was all back in!
Extra seal courtesy of black UniBond drain and gutter sealant
Should finish off the 'black' tinted look as my current front lights are non-tinted. That just leaves the sidelights to change at some point.