I wouldn't recommend using alloy posts & towers, that will indeed increase the chances of bending the towers. Use short plastic posts and alloy towers for best results ( long posts in any material will be prone to bending or snapping... ). There are various options that should fit fine:
http://cgi.ebay.com/LOSI-LOSB2450-F-...item3f08ca82d5
http://cgi.ebay.com/88315-Body-Posts...item588ccdae99
http://cgi.ebay.com/Heng-Long-Land-O...item23106869b6
http://www.rcraveninc.com/category/e...odymountposts/
otherwise you can make your own from some nylon rod the correct diameter & cross drill it for the mounting screws and body clips ( 2mm drill bit should do the trick ).