0311-861151 Aero (OEM) Easy Cover Arm End Casting for Use with New Style Round Steel Cross Arm. This simpler design allows you to connect the Legacy Teardrop Swing Arms to the updated Round Steel Cross Arm. This Arm End is not identical to the Aero Legacy Teardrop Swing Arm Corner, which is for use with the Old Style Legacy Teardrop Aluminum Cross Arm
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