I hope Paul doesn't mind me trying to help. The new style c-hubs have a larger opening to accommodate the ecs drives. The T3R comes with the older style c-hubs.
New style
Old style
The picture's perspective doesn't show it well in the second picture, but the older style has a smaller opening.
I would buy a new set of the 302363 and 302364 c-hubs if it were me.