Ron:
McMaster-Carr and W.W. Grainger (
www.grainger.com) are not magazines; they're industrial/commercial supply companies whose catalogues dwarf a copy of War and Peace. They may not sell direct to retail customers however.
Another thought would be to check auto supplies in your local Business-to-Business Yellow Pages. Those hoses must be readily available since I see them in use at Sears, Pep Boys, and the local Texaco station. If you strike out, I'll wander up and ask them in the next day or two.
Scott