I was looking around Ebay and saw this. Thought they might be of interest to the group?
1100/11-87 10 shot mag extension
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=412920816
1100/11-87 10 shot mag extension
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=412920816