I don't know how original you want to go but there's a list here
Original Cobra Parts that may help with your parts search. I don't like paying "Cobra" prices for garden variety British stuff. Things like headlights can also be sourced from Triumph, MG etc. Keep an eye on the for sale stuff here on CC and bide your time on e-bay once you know what your looking for. Also be nice to Santa, (s)he sometimes shops at places like Finishline and Cobranda........