Are all 273 V8's the same?

Someone on FBBO said there is a member here that makes a crank adapter bushing for this. Anyone know if this is true?
Are you referring to adapting a later large hole crank to accept a small button converter? If so, yes, those are available, but I can't remember who sells them. If you're referring to an early 273 crank that isn't machined for a manual trans pilot bushing, Brewer's has a BEARING assy to do that.