Z4 centre brake light

[Sortie 10]

My centre brake light on my 2003 Z4 is broken. Can anyone recommend a reliable supplier for a replacement unit - must be transparent to match the existing (which suits the Sterling Grey paintwork). Dealer has quoted me just over £50, which doesn't sound too far off the pace but I'm all for saving money, so if a parts merchant could do it for half the price I would be chuffed!

I assume that it is a relatively straightforward job - removing trim from inside bootlid and taking out the old and slotting the new in its place. Please confirm - at present recovering from a broken arm so do not want to tie myself in knots.

Thanks for any help