Yes, there is a difference. the 46 parking light housing is a one piece unit with a smaller lense. Mine are glass, some are plastic. The 41 housing is two pieces with a longetr lense. I dont think you can get the 41 lenses in glass anymore. I'm perty sure you can use either of the the housings on your headlight buckets. They are pretty much the same shape.
Hope this helps
George
