American classic part # BR0304 would probably fit. http://www.americanclassic.com/asp/dynca...amp;exyear=1959
1 1/4" thread diameter, check your thread diameter and see what it is. Mine has a hex shape on the top.
as far as the htydravac, here is a note I pulled from another thread a while ago.
DS in VA has done a very good job for me, 276-322-3119, Jeff is the hydrovac gentleman, very knowledgeable, reasonable prices, unlike some others.
