Sometimes it's more effective, cost and time-wise, to purchase a rebuilt unit from NAPA. They usually have access to them on special order, sometimes even overnight from one of their warehouse distributors. Try to find any ID tags there might be on your part, and/or take a few pictures to help the counter guy pick a suitable item. Also, try to find a parts guy with gray hair and enough brain cells to rub together to read a paper catalog. The 20-something keyboard jockey with the man bun at the front counter probably won't be much help! Most Hydrovacs aren't brand-specific. They go by gross vehicle weight rather than Ford/Chevy/Dodge/International, etc.
LOL!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!