KF2231 and KF2232 are now available. I assembled them this week-end on the E4RS II. Greatest advantage is the better alignement of the arm axles, especially on the rear end due to the pivot ball instead of bent plastic holders.
More pictures bellow.
KF2231 - Option Part – E4RSII – Aluminium 7075 – Front Arm Holder:
KF2232 - Option Part – E4RSII – Aluminium 7075 – RearArm Holder: