Trying to get this out before kick-off and failing (just).
This is the figure where I have updated the team with the change (England) because it affects the diagram. Willie Heinz, who has been replaced due to injury, linked England to Gloucester, while they are linked to South Africa by Franco Mostert. Therefore, there are now fewer links between the two teams.
The addition of Ben Spencer to the England team to replace Willie Heinz means that the club team with the most players in the final are Saracens with 10 (9 for England, 1 for South Africa).
They are followed by Stormers with 9 (all for South Africa) and Bulls, Bath and Leicester Tigers (Bulls all South Africa, Leicester all England, the Bath players are from both).
Of the club teams, Sale Sharks are closest to the centre.