DIMENSIONS
1911     6 1/2" x 12"          1921-23  1-3-digit  4 3/8" x 10"
1912-14  4 1/2" x 10"                     4-digit  4 3/8" x 11 1/4"
1915-19  6"     x 13"                     5-digit  4 3/8" x 12 1/2"
1920     4 1/2" x 13"

              1924, 1926               1925
1-4-digit  5 1/2" x 10 1/4"      5 1/2" x 10 1/4"
  5-digit  5 1/2" x 13 1/4"      5 1/2" x 12 1/2"

1927-30       6 1/2" x 10 3/4"
1931-present  6"     x 12"

TAB DIMENSIONS                   STICKER DIMENSIONS
1919-43  3"     x  3"            1944 WINDSHIELD    2 3/4" x 4 1/2"
1949-51  1 1/4" x  2 1/2"        1973-75 OVAL PLATE   7/8" x 1 1/2"
1953-57  2"     x 12"            1978-79 PLATE      1"     x 1 1/2"
1959-70  2"     x  9"               (Verify 1971-72, 1977, 1980-on)