I recently went through this same issue.

I looked for a long time and was surprised at the difference in price of the available conversion head light bulbs. I was looking for a "more stock" looking seal beam conversion and did not want to spend $175 and up. I purchased mine from C.W.Moss (Vintique's retail store). They were about $40 each, have high and low beam headlights with H4 bulbs and a parking and turn signal bulb socket added inside the reflector. The parking and turn signals are "very bright" with the headlights turned off, and are "acceptably bright" when the headlights are turned on.

I did not run conduits, and was able to get all the wires to run through the hollow headlight mounting bolts.