Need Source for Slim Outdoor Lights

I have 2 posts on my front porch, and I want to replace the lights mounted on the sides. The posts are nominal 4x4s (really 3 1/2" x 3 1/2"). I'm looking for lights that have baseplates no wider than the posts.

Does anybody know where I can find such lights? E-mail company recommendations directly to: swbarm AT sonic.net, or post in the Rec Room.

Thanks.