I believe this is for all Argosy 525 and up to serial number 823 of the 525D. Bill, NT1R -- FAQ on WWW: http://www.contesting.com/tentecfaq.htm Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com Search: http://www.contesting.com/km9p/search.htm