Another way of wiring these up as markers and turn signals for cheap:
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The diodes are #276-1101 from Radio Shack. I can't remember if this was for the small package or the variety pack. When I went to the local Shack they were out of the small pack (I think I needed 2 or 3 packs). I looked through their stuff and found a pack that had 10 of the correct diodes, along with a number of other sizes, which was actually cheaper than buying several packs of only the correct diode.
This post is courtesy of Don (handcannon) over on dieselplace.
This is how I did mine a couple of early last year and it has worked great.