Big T... the package says they are Union Pacific. I got them from a "big truck" place that I thought was a chroming shop. Well, when I walked in it was only that they sold Chrome stuff for big trucks, no actual chroming. He had a big display of stuff for big trucks but you know a lot of stuff can be used on different stuff. I bought them a few months ago and just now got to but them in. They were about $32 for both. The only thing I did not realize was it is not a metal housing but is a heavy chromed plastic. But, hey, for the money it works, easy to mount and if I decide to do different it won't be hard to do.
If you wanted to call the place I can get the number off the invoice which is in the shop. The address is Spartanburg, S.C.
Hope this helps.....say, check out one of the "big truck" places around you that caters to the big rigs and see what you can find. Might find something you even like better?