spotlight

I have a eBay kit to instal fogs to the front bumper. It came with unpainted replacement panels. These look exactly the same as the painted ones apart from they have no holes for the lights. Question is has anyone tried just cutting the backs of the originals so no painting is required?

Pair of neat little 12v 10w halogen spots for inside a campervan - good for reading or over kitchen area etc. Integral switches. Both in pretty good condition but one has a couple of scratches to the silver coating. £10 delivered to UK