Outside dimensions, not counting flange, are:

Length-35 1/2"

Width- 8 7/8"

Depth- 8"

Flange is 1 1/2" all the way around, so overall dimensions are approximately 38 1/2" x 11 7/8"

See photo above that shows exactly where measurements are taken from.

May have a scuff or two, but brand new never installed or used.

Used for leaning post or any custom drop-in/under seat storage application.