Retrorockit
Retro Guru
Holland Bike sells RST steerer tubes separately. I've heard of them being used on Marzocchi forks. Since they fit the same headsets they may be generic. I have one sitting around just in case but I haven't tried it yet.
https://hollandbikeshop.com/en-gb/advanced_search_result.php?keywords=RST+Steerer
				
			https://hollandbikeshop.com/en-gb/advanced_search_result.php?keywords=RST+Steerer
 
 
		

 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		