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Differances in a arms 12 and 13 pro

P
Jan 22, 2008
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How do you tell the difference from a 12 pro rmk to a 13 and newer Upper a arm? The reason I ask is I need to replace a upper a arm on the sled. The previous owner has put on 13 glued a arms on it. So I am trying to figure out if he used the 13 upper a arms. Thanks for the help.
 
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