What confuses me is that the Yoke on the 12-bolt seems to be set up for external tabs and not internal C-clips like you would find on a 3R type joint with the factory injected plastic.   
 
Did they have a conversion U-joint or something at the rear, or did the rear joint still have the cups with grooves for internal C-clips / plastic where it mates with the yoke?  What is the diameter of the u-joint caps used with the 9210 rear yoke?
		 
		
		
		
		
		
		
		
		
	
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