I have seen a few of these Airhead side panels with the mounting lugs broke 
I repaired mine with these aluminium pieces I machined and then attached with a small screw
They have been working perfectly for years now
Here are some pics of how they work
Far cheaper than getting another panel and tidy too
<a href="http://s168.photobucket.com/user/pbgaza/media/interesting/p1_zpsgmew34qp.jpg.html" target="_blank"><img src="http://i168.photobucket.com/albums/u181/pbgaza/interesting/p1_zpsgmew34qp.jpg" border="0" alt=" photo p1_zpsgmew34qp.jpg"/></a>
<a href="http://s168.photobucket.com/user/pbgaza/media/interesting/p2_zpshvt8awpm.jpg.html" target="_blank"><img src="http://i168.photobucket.com/albums/u181/pbgaza/interesting/p2_zpshvt8awpm.jpg" border="0" alt=" photo p2_zpshvt8awpm.jpg"/></a>
<a href="http://s168.photobucket.com/user/pbgaza/media/interesting/p3_zps29wa1jmn.jpg.html" target="_blank"><img src="http://i168.photobucket.com/albums/u181/pbgaza/interesting/p3_zps29wa1jmn.jpg" border="0" alt=" photo p3_zps29wa1jmn.jpg"/></a>

I repaired mine with these aluminium pieces I machined and then attached with a small screw
They have been working perfectly for years now
Here are some pics of how they work
Far cheaper than getting another panel and tidy too
<a href="http://s168.photobucket.com/user/pbgaza/media/interesting/p1_zpsgmew34qp.jpg.html" target="_blank"><img src="http://i168.photobucket.com/albums/u181/pbgaza/interesting/p1_zpsgmew34qp.jpg" border="0" alt=" photo p1_zpsgmew34qp.jpg"/></a>
<a href="http://s168.photobucket.com/user/pbgaza/media/interesting/p2_zpshvt8awpm.jpg.html" target="_blank"><img src="http://i168.photobucket.com/albums/u181/pbgaza/interesting/p2_zpshvt8awpm.jpg" border="0" alt=" photo p2_zpshvt8awpm.jpg"/></a>
<a href="http://s168.photobucket.com/user/pbgaza/media/interesting/p3_zps29wa1jmn.jpg.html" target="_blank"><img src="http://i168.photobucket.com/albums/u181/pbgaza/interesting/p3_zps29wa1jmn.jpg" border="0" alt=" photo p3_zps29wa1jmn.jpg"/></a>
