You might be able to fit the small MR16 lights. Duckworks has them, but no install kit for the wingtip like you have.
http://www.duckworksav.com/Upgrades....HID%20Upgrades Scroll down to the bottom to see the MR16 lights. The lights Duckworks sell are HID's, so they are a little more expensive, but it gives you a good idea of what they look like.
The best bet is probably to get one of the regular leading edge kits. It requires a little more work, but it was designed to be able to be installed into a completed airplane without even hurting the paint finish.
http://www.duckworksav.com/LELightKits.html This link shows them, but I think you have to buy it from Vans.
http://www.vansaircraft.com/cgi-bin/...product=llight
That is a link straight to the leading edge kits from Vans.
Hope that helps.