Philo
I hope this is what you need.
In the 1958 Ford Truck Shop Manual page 2-83 under Water Pump-MD and HD V-8 Engines,
Assembly:
in Fig.17-Hub Installation-Typical
it gives the following:
4.15-272,292 MD AND HD V-8 ENGINE.
Right beneath that it says:
4.72-272 (ECW) MD V-8 ENGINE
Hope that helps
Mike
I'd rather be lucky than good.................
but good ain't bad!!