I'm not sure about your numbers. The Canadian parts manual gives a NSN of 2530-00-691-8631 which then gets superceded by 2530-00-846-6241. The GM number for both kits is 2297689. My manual is dated 8 Nov 1976. 
 
Your part number of 2283351 does not show in the index for the Cdn M135.  
 
Neither of your part numbers show in the Canadian catalogue of material, although these was a NSN of 2530-00-741-0844, although it shows no data.  
 
Below are some other part numbers for the 00-846-6241 part number. Of interest is the first number as it is an International number. I would not hold my breath on any of these kits being available at your local NAPA.  
  
Note that on the numbers below the first five digits are the NSCM (manufacturer's code). 
 
31007 147711R92 
89346 147711R92  
92679 147711R92  
23862 2297689  
24617 2297689  
14892 376037  
24617 376037  
73160 376037  
19207 8331890 
   
 The museum here did send an airpac to Niagara military sales about a decade back, who sent it to a rebuilder somewhere around there. I think the rebuild ended up costing around $600 if I recall correctly. For that kind of money I would suggest picking up one of the more modern ones from the MLVW/M35 and plumbing it in.
		 
		
		
		
		
		
		
		
		
			
			
			
			
				 
			
			
			
			
			
			
			
				
			
			
			
		 
	
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