Orings for 4" RO housing

[Diesel Pro]

Are these a somewhat standard size?

My housing came missing the orings and I have zero confidence in Fresh Water Systems getting me the specs let alone the parts. I was hoping to run the machine this weekend, but without housing orings I'm stuck.

I would guess that they are basic 4" OD and 3.5" ID .250 thick. This would give me a quite a bit of compression by my calculations.

[Diesel Pro]

I think the joint that shorted me on these is finaly sending then overnight. We'll see if they get here in one day's transit on Fedex.