| By Lanny White - 6 Years Ago | 
		
		| I have among my hundreds of '54 Merc spare parts a NOS blower/fan switch, part # B3AZ-18578-A.  The part number indicating fitment for a 1954 is FDC 18578 B and I am wondering if any of you Y-Blockers can decode the prefix (B3AZ) as to year specific for this switch.  It is possible that it fits '49 - '53 which obviously would not be in the Y-Block era, but some of us straddle the line with the flatties. 
 Any help out there?
 
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		| By Hoosier Hurricane - 6 Years Ago | 
		
		| The B3AZ prefix indicates '53 Ford passenger car.  That doesn't mean it doesn't fit other years and models though. | 
	
		
				      		    
		
		| By Lanny White - 6 Years Ago | 
		
		| Thanks, Hoosier Hurricane.  I have three separate 1954 Mercury shop manuals, repair and parts, and one covers '53-'54 and another '54-55.  I had guessed the prefix was for '53 but wanted to be sure before making it available for sale. 
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		| By oldcarmark - 6 Years Ago | 
		
		| According to my Parts Catalog 52 and 53 Ford Passenger Car with standard Heater use the same Switch. | 
	
		
				      		    
		
		| By DryLakesRacer - 6 Years Ago | 
		
		| Fords prefix is good but I've always liked Harley Davidsons suffix. after the Part # there is a dash XX and what ever the number is the year it was first used. My 91 has parts that were first made as early as 72. All these #'s are good to know..
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