Anyone have an 18" partner steel griddle, need measurements....

[DesertSand05]

I need a griddle for my snow peak double burner stove. because of the pegs on the grates I can only do about 17 1/2" in length.

Does anyone with the partner stove 18" griddle measure the griddle's actual bottom dimensions for me?

Looking to get a good griddle, but not sure the 18" one will fit what i have.