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 “


Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 5
Teddy - 17h1 Irish Draught cross