Re: Where can you get these....???
For what it's worth, I was warned against the straight couplers, for the cracking reason mentioned above.
Think about the amount of play induced between two velcro-mounted pedals when stomping on one, or if not mounted, the amount of wiggle just with the little rubber feet between one and the other. Some pedals do not have perfectly vertical sides, which leads to problems with these kinds of couplers, too.