Jim,
To be more specific what I am saying is the actual spring perches are the same with that stepped design. So the one end is larger than the other end.
The spring perch bushings, yes, there is two different designs like you say. The 65/66 style and the 67+ style.
As far as the guide I have on my website I dont see any issues with the pages, so maybe just try a different browser or computer and see if you still have issues.