Lynn, I have an instructional manual for same, I can copy and send to you if you like. I have two of these fixtures. 
I believe that the adapter fitting you have is the cam spacer which is required on early model flatheads running later model dizzys or vice versa (can't recall which is which at the moment...)
		 
		
		
		
		
		
		
			
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				3RD Echelon Wksp 
 
1968 M274A5 Mule Baifield USMC 
1966 M274A2 Mule BMY USMC 
1966 M274A2 Mule BMY USMC 
1958 M274 Mule Willys US Army 
1970 M38A1 CDN3 70-08715 1 CSR 
1943 Converto Airborne Trailer 
1983 M1009 CUCV 
1957 Triumph TRW 500cc 
 
RT-524, PRC-77s,  
and trucks and stuff and more stuff and and....... 
 
OMVA, MVPA, G503, Steel Soldiers
			 
		
		
		
		
		
	
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