As of 2015, Power King tractor parts are available from Mission Manufacturing at powerkingtractor.com and Service Pro Parts at powerking.info. Parts can also be found from Jerry Frank at powerkingtractorbarn.com, as well on eBay.com.
According to tractordata.com, Power King tractors were built by Engineering Products Company, or EPCO of Wisconsin. In 1977, Power King became the brand for the entire line and then was sold to Support Services International in 1990. Mission Manufacturing now owns the rights to Power King and supports the tractors. Mission Manufacturing provides email and phone support related to questions about Power King tractor parts, and the company ships parts and attachments daily.