I look up what I want in a dozen places on line, then I go tell the local what I want. I never ask them.
Here's a good one for you. Raybestos WC14493/4= single, centered inlet. Wagner WC14493/4= dual inlet (offset bosses). Go figure. I wish I was there to see the problem. I am sure you are not the first guy to get new WC, Someone with a 55.1 will help.
Fading Fun:
I get that way sometimes with fixing up trucks. It's a thing we all go thru. We get older, see the end of the build is far away, part troubles, hot summers, cold winters, other interests, wives (bless their hearts). Gumption returns when you watch a TV show, read the Stovebolt, see one driving down the street or someone keeps asking "when are you going to get that done!" (bless their hearts)
The hose you want is BH13841 Long nose, with the slot/groove, for 3/16 lines (3/8-24) and fits WC inlet (7/16-20). Cheer up!
