I remember that some folks were looking for this 1950/1951 WR gear case cover. Here is the place reproducing them.
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Be sure to visit;
http://www.vintageamericanmotorcycles.com/main.php
Be sure to register at the site so you can see large images.
Also be sure to visit http://www.caimag.com/forum/ -
I still need a cover, but I need the earlier style!
RobbieRobbie Knight Amca #2736
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