I didn't realize it, but yes they do. The first one is comparable to the one I had. It is a 100lb instead of 90lb. Either way you definately want one made like this as opposed to the second link if you can afford it. IMO it it worth the extra $.
http://www.caswellplating.com/aids/cyclone/blmobile.htm
http://www.caswellplating.com/aids/SB5.html