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			Meir, 
I replaced all the plastic parts (11-13) because I was in there anyway.  
If you want to replace the foam seals the P/N for the kit is 000-043-300-45. I paid about $55 for the kit which includes some parts you won't need/use but got the foam & some other little rubber pieces to replace.  
Take your time & follow Mike Focke's instructions posted here, they are the most detailed & complete. 
If I can be any help let me know.
		 
		
		
		
		
		
		
		
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