I would go with Cibie H180 as an upgrade. Better quality than most.
There are some for sale here - no idea if the vendor is reputable - this is the result of a quick google on “ 7” Sealed Beam Cibie H180 Upgrade “
I replaced my headlights with these too.....from Librands I think. Excellent light performance for what they are. I did buy some Lucas Tribar lights..... they were dreadful with light scatter all over the place. Looked the biz though.
Jays Former Morgan owner. Gone but hopefully not forgotten!
