Yeah, the files are pro/e files. I opened them earlier, they are of the exhaust ports. One looks like the one we have, the other one is somewhat different, looks like he made up one to go on the outside rather than on the inside, but it may have never been made.
We may want to consider making a piece that can be attached on the outside of the regulator, that way the air flow is more free to flow out and will possibly reduce the chance of free-flow, which would be good for any kids who don't like to have their regs tuned all the way down like I do.