I just bought a pair from The Truck Shop ($26 ea.) ... there were 2 mounting bolts and I assumed those go on the bottom (?) ... that's why I said "wider at the top."

I'm using these as backup lights on my '54 and I was going to put the wider at the top ... now I think I'll go wider at the bottom!
grin
It really is hard to tell which looks better ... but wider at the bottom DOES make more sense, design-wise.

~~ Alan Horvath
1954 Chevy Pickup
Singing his praises in the
Passing Lane