False bottom for 19 gallon economy kettle

Has anyone found a false bottom to fit this 19 gallon SS two-weld economy pot?

http://www.ontariobeerkegs.com/19_Gallon_Brew_Kettle_OntarioBeerKegs_p/19-gallon-2weld.htm

The dimensions are as follows:

Pot measures 18" across and 18" tall
ID is 17.875" across x 17.875" tall
Center of bottom port 1.25" from bottom (1.35Gallon Mark)
Center of top port 5.5" from bottom (5.97Gallon Mark)

I was looking at the following and wondered if it would fit:

http://morebeer.com/view_product/74...Kettle_Screen_for_15_Gallon_Heavy_Duty_Kettle

I assume that these false bottoms need to fit perfectly. The bottom from morebeer is listed as being 17 5/8" in diameter.

I'm worried that this will be cutting it VERY close.

A standard 12" domed false bottom will work just fine with that kettle.

http://www.amazon.com/dp/B004B7GIV8/?tag=skimlinks_replacement-20

I'm assuming this is for a mash tun? The domed false bottom is fine unless you're wanting to direct fire, in which case you'd need a full false bottom. The morebeer one may work, but why not play it safe and get a custom one from Jaybird?