Check into Rockauto, or Amazon. Another place is Upullits for factory housings. And check out Sylvania Silverstar bulbs.
Is your housings fogged over on the outside, or inside? If its just the outside, get some polishing compound, and go to town on them. And then spray them with a clear coat. A body shop friend told me about this.
My 91 sitting in the shed has a 4runner front clip, and the housings are full of old rusty water.