These are the 12mm thick adaptor plates to fix the existing ankle contact plate to the new tibia beak ring. There will be a second 2mm thick plate sandwiched between this and the sensor plate in order to seal the sensor electronics,l the only difference being the omission of the second ring of 8 x M8 tapped holes. These plates also have the ball joint attached to them with the inner ring of 4 x 8.5mm countersunk holes.
