Does anybody make working marker lamps for steam motive power?

Edit: Oh and I’m looking for HO scale.

I really want to replace the front marker lamps on my steam engines with working ones.

I found these nice brass castings, but want something that actually lights up.

http://www.walthers.com/exec/productinfo/190-312

Providing none are available, has anybody ever tried to scratch build some using fiber optics as a light channel?

Tomar makes 2 with red/green or red/yellow lenses. They have 1.5V lamps, so be sure to put a proper dropping resistor or you will fry the lamp

http://www.walthers.com/exec/search?category=&scale=H&manu=tomar&item=&keywords=marker&instock=Q&split=90&Submit=Search