its the catalog in PDF so it may take a few seconds to load, but if you look on page 20, they're there, i dont know when the catalog was made so may be some parts arent made anymore, but i know the same catalog was up as early as 2007.
I will post more pics tomorrow. Yes it is a clamp! I believe the only way to get the cranks off the bike is to open up the bracket! It is very odd to me! I'm just wondering what year sieberling used this idea? Like I said, it's on a womans 26" sieberling roadking ballooner!