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I understand there are different Power Steering units and I suppose they take different belts. 1969 F350 only: Unless it has factory A/C, the Bendix or Ford/Saginaw P/S belt makes no difference.
Take the Motorcraft part numbers (JB 456 for example) to auto parts stores, can be crossed over to the brands they sell.
Pic: Scroll down to the 1969 (F100/350) 360/390 fan belt applications:
Thanks Number Dummy, that is exactly what I needed !! Found that RockAuto had some of these crossover numbers in Dayco and Gates belts. Many at Clearance prices one I bought cost .71 cents.