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Auto-Lite A5 was the standard equipment plugs for all Frazers and 1947-51 Kaisers. During the 1951 model year, K-F went to the slightly higherheat A-7 which was used through production. However there is a K-F Service Bulletin from 1951 that advises you can go back to the A-5 heat range plug if you had at least 5,000 miles on the motor and having problems with vapor lock. Willys product used Auto-Lite AL7 plugs or Champion J-8 with HJ's and the Darrins using A-7 plugs. Allstates used the Allstate brand plug that matched specs of the A-7. Former Chief Judge insisted on the J-8 for ALL K-F products; strange he also sold J-8's because he coiuldn't get Auto-Liute plugs at wholesale.