You can go to JDparts.com and lookup their parts catalog to look at the diagram. You can call your local dealer and get signed up and get SOME prices online, but just get the number and call the dealer is easier. The less common parts you have to call the dealer anyway. If you're looking for used put the part number into machinerytrader, I don't know what the ball joint is, may be a common part? not deere specific.