I need some help. I recently purchased a used shaker assembly for my 'R' code. The question I have involves the shaker base. Every indication shows it to be correct except that it is 16-3/8 inches in diameter and 2-7/8 inches tall. Mustang Monthly's article about shakers listed them as 18.83 by 5.5...it never says where it's measuring from and to. I need someone with an authentic cobrajet shaker to go out and measure theirs. I need to know if mine is correct. Any help would be appreciated!