I've never used a Master Parts Catalogs, and I need help reading it.

I'm trying to make sure that all the parts for my carb are correct for it, and I've run across a problem.

http://chevy.oldcarmanualproject.com/1929_57chevyparts/57cmpc0292.htm

Under 3.730 Horn Assembly, most say "w/ main well assembly (stamped XXXX)". Are they describing the number that would be stamped on the main well assembly? or on the airhorn?

My conflict is... that if I use my main well # (stamped 4623) it would leads me to believe that it for a 54-57 COMM UTIL (6 cyl). But If I assume that they are talking about the airhorn number (stamped 4509), it points to a 50-53 ALL w/ 216.

Clear as mud?

Bryan
1954 3104 235 "AD" L-6 3-on-the tree