Speak to Anthony at Classic and vintage bulbs. He supplies new good quality original pattern steel headlight buckets. he also has the correct MGB trim rings used on the Cobra (mini trim rings are to large diameter).
Classic and Vintage Bulbs
I picked up a Narva H4 lamp kit with park lights and QH bulbs for about $100. These got me thru rego OK and throw out a pretty good light.
Cheers