here is a picture of the fill tube setup for top-fill convertibles, got this pic from an ebay auction for one.
Here is the link for it if anyone is in need of one of these.
Sam
[URL unfurl="true"]http://cgi.ebay.com/HOOVER-Vacuum-Cleaner-Bellows-Fill-Tube-for-A-Bag_W0QQitemZ200332572782QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item200332572782&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C[/URL]
[ATTACH=full]17308[/ATTACH]
