The 1958 Series 2 has a clamp type fitting - I know of no boss kit designed for these, nor in fact any other post-50s car that uses a similar fitting, although you they were fairly common from the thirties and forties. 
I think you will find that to use a different steering wheel you will just about have to fit a post suffix C steering box, which used a nut to hold the wheel on. There are bosses available for these, and also other wheels that fit. 
The steering box is a bolt-in replacement (with wheel) and remained the same from there up to the end of S3 production except for modifications for a steering lock etc, so should be easy to find one.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
Bookmarks