The BOB quick release is very specific to BOB trailers. The front arms on the trailer hook over the ends of the quick release. These ends are machined to a specific diameter and rotate on the quick release. As far as I know, there is no substitute.
While you're ordering a quick release, I recommed you buy a couple extra locking pins for the front hooks. They're cheap, but if one gets lost or breaks, the trailer is unusable.