I went to the limits of my data cross-checking on some 69 Buildsheets for Fans.
RamIII Standard Fan (with "BO" 3 core Radiator) is a 53 Spacer and a 346 Blade.
We know this to be a Non-Clutch 5 Blade Fan
A/C is PH spacer with 546 Blade
RamIII HD Cooling (with "PA" 4 core) is a 53 Spacer and a 346 Blade.
RamIII HD Cooling -AND- HD Fan (with "PA" 4 core) is _H Spacer and a 134 Blade
This is a Clutched 7 Blade Fan
RamIV - no sheets from proper plants to fully relate codes correctly
For 1968 - Ram Air Engines - its looking like probably had to special order the option # 514 to get the "Fan and Clutch HD 7 Blade $5.27" .
I had never even paid attention to that option being in the list before.
If #514 was inclusive with R/A option, it would probably be called out with the same verbage.
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