Hi Lukas,
For the Touring B, the 1902 model year per Don Ball's Locomobile book says the wheelbase is 73 inches. The 1903 model year in Floyd Clymer's reprint show's 79 inches. The original wire wheels were single tube 28" and most of them were replaced because of availability of tires. I can't speak to the 2 venturi system, but I have now put a picture of my burner in my Locomobile web site: [
cid-5f75268df2f60d67.spaces.live.com] It's the last picture. Your burner might have been upgraded to the 2 venturi's at some point. You might be able to draw a conclusion after looking at the picture.
I believe the "burner, improved design" refers to the 1903 style with the new pilot, pre heater and superheated steam. I don't have knowledge if the pattern is different.
All in all, you have a quite complete and rare automobile. Neither Art Hart or Don Ball have ever seen one!
Brad