Matlack, Kranepool, Grote, Koosman, Seaver, and Harrelson is a seven-year six pack. You can probably add another one or two but I got tired of looking. Not really. Matlack debuted July 11, 1971 and Seaver was dealt off June 15, 1977, so a little under six years. Kranepool was recalled from the minors on August 14, 1970, so that's not quite seven years, either. Garrett was traded July 21, 1976, and he debuted at the beginning of 1969, so his Met run was seven and a half years, accompanied the whole way by Koosman, Grote, Seaver and Harrelson. Tug McGraw was a teammate from 1969 through 1975, six seasons. Seaver, Grote, Harrelson and McGraw lasted from 1967 through 1975, eight full seasons. Seaver, Koosman, Grote, and Harrelson lasted from late 1967 (Koosman's call-up) through the Seaver deal, nine and a half years, which is the longest Met foursome ever, I think. Also in the "not really" category is my assertion that Harrelson's debut in 1965 stuck. Nope. He spent much of the next year at AAA.