Perfecto 40g Breeder INNER Dimensions

[HardCory]

I'm looking for the confirmation on the inner width dimension.
I'm 90% sure that it's 17 1/2", but I'd like somebody to back that up.
Thanks!

 

[Even Further]

Having done glass work and templates for baffles, I would buy the tank first. Then, take the measurements and/or make cardboard templates. The tanks are made within a certain tolerance, and its best to buy it first.