The Model B-9 triple brush shampooer-scrubber was manufactured by Electrolux Corporation from 1983-84  The company is now called Aerus LLC and is headquartered in Dallas, Texas with store locations throughout the USA and Canada.  An Aerus associate will be able to give you the information on the seal.  Contact information may be found at aerusvacuums.com.  Also, if you'd like to obtain a free electronic copy of the current model's manual from the homepage click on the Support tab, select the Download Manuals hyperlink, choose Lux Floor Pro from the Current Models menu, and click Download.  Regards.