Hy Guys, in the parts book, group 8.039 PLATE, series designation. From 1951 through 55 first series there is a specific plate for each series
11 series, 13 series, 14 series (21-24), 14 series (31-35), 15 series, 16 series, 17 series, 18 series. The same is the case for the Canadian GMCs of the same vintage. There are no individual plates listed in the 55B or second series through 59 series, hope that clarifies.