Hopefully this will help you, there are several version of the "B" zeniths and ALSO "Technically" there is a different one for the 33-34 4cyl's. Generally speaking the "raised" bowl Zenith will be for 1932 and the "indented" bowl for 33-34. The one "spring" that comes to my mind is actually on the choke cable, not the carburetor, David Renner at Renner's Corner would be the "go to" man!!!!