Anyone used Andover seat belts as replacments? I ordered some new carpet today, and don't know if I want to cut into the sides and use the big seat belt assembly that I now have. They don't appear that safe. I saw them in a forum and bookmarked the site...any help.. What version should I get 8 1/2" offset at top or 2 1/2"...pushsbutton or the retrofit retractable?