I'll be using H4's but was planning to use units intended for a British spec Austin Mini.(They are tight though as I'll need to use ones with parking lights built-in)and i'll need to modify the buckets slightly.
I am using my original parking lights as turn signals with orange bulbs.
We have to have them separate.
I've also got the LH dip beam to consider,seeing as I drive on the wrong side of the road! drive

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.