I had to buy a couple more rudder pedal blocks because I couldn't find the ones they sent me. They're not cheap: $13 or something like that. Then I split them in half as directed and clamped to the rudder pedals, then added the additional tubed parts.
That's when I found a discrepancy. The plans appear to either have the labels reversed, or the labels on the parts, including the master cylinders incorrect. I'm opting for the former.
Unfortunately, all the Van's support team is at Oshkosh but it appears from talking to people online that the plans labels are, indeed, reversed, so I'll plan on building to the figures in the plans, not the labels.