Can I use backwards bulkheads on my BRUTE's?

[FishyFishy!]

I'm plumbing up my mixing station, and I'm a little short on space. I would rather be able to use my bulkheads backwards so that the outside is the flat side instead of the 2" bulkhead extension.

Has anyone ever done this on a BRUTE? I'd assume that the rubber gasket would go on the outside. Would it work? Any suggestions? I know I could use uni-seals, but I have no idea where i'd find those aside from BRS.