Customs Dummy spot lights Different sizes ??

Up until now i thought these lights were the same size ,but i recently bought a car with a set that are 6" in diameter and 6" tall. The other set i have are 4.5" in diameter and 5" tall aprox. Can anybody shed some light to what the larger ones are ? Thanks

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I think you have these. Made by Bill Layman but I read somewhere that they are no longer made. A real shame.

 

Never understood using the fakes.