i installed Amber city lights wired into my parking lights into all 4 H4 converted headlights on my wagon. it looks prety sweet when the headlight are off.
there is a place in Seatac WA that used to sell a sort of sticker that was pre cut to fit 5 or 7 inch round headlights. the sticker was about 1/16 thick and was made to protect your H4 conversion headlights from rock chips and such.
it was available in sheets as well, cut your own.
they had clear, smoke tint and yellow.
i haven't been there in years so you'll have to call and see if its still available.
hell of a lot cheaper and wont fade.
Auto Sport Imports
19611 International Blvd
Seatac, WA 98188
(206) 878-5230