I ordered a pair of the "Yellow Baloons" to see how they would fit. I also ordered a pair of yellow 55 watt H3 bulbs and a pair of the original 35 watt BA 20 bulbs as a back up if this halogen conversion didn't work.
http://www.rallylights.com/detail.aspx?ID=1419By making a simple change in the bend of two of the 4 tabs where the baloons attach to a H4 lamp they will clip securely to the lamp base of the headlight door with an H3 lamp sandwitched in-between the two. I soldered a short length of wire to the 5 prong male wire connecter with a female spade connector at the other end for the H3 bulb to plug into.
I'll take some pics and start a thread on the R&D board with more detailed instructions,
It realy looks as though this baloon was made to do this conversion, Once it gets dark I will go out and see how well they actually light up the road, but from my measurements it looked like the fillament of the H3 is very close to the original position of the BA20's.
If my memory serves correctly, Both the Euro lamps and the 69 and older USA head lamp doors use the same lamp base for the fog lamp and parking lamp bulbs. So it is possible this conversion would work on the fish-bowl headlamps too.