I was told that the CV joints needed to be replace on my 81 240D. 1. On fast line there are two kits that you can buy (1)Outer (2)Inner. What is the difference? What one should I get. Here is the link: http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1981%40%401981&makeid=63%40%40MERCEDES-BENZ%40%4063&modelid=6141%40%40240D&keyword=cv&subcatid=P:241427@@CV+Boot+Kit&mode=PA 2. How many CV joints are there? Should replace all them? Sorry for allot of dumb questions. Thanks

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1981 240D
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