Grand Marquis and Crown Vic. guys "Help"

[______ 10+ year member]

Need help from the crown vic and grand marquis drivers.... Im building a box for a guys trunk, The issue is he went out of town and I need to check a measurement so I can have it done B4 he gets back.

I need to know how big (top to bottom) I can make this box with that little step in there

**Pic below shows what Im looking for**

Thanks you in advance for the help guys

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[______ 10+ year member]

18".... I saw some one at the store with a grand marquis and asked them if I could take a look at there trunk

Lock it up plz

Thanks