This steel flange is fitted as standard to later R1200 models, and replaces the earlier aluminium item. Please note, if you are replacing an aluminium flange, you will also need the spacer ring TRE21832 (or TRA21832 in new stock) to fit this item. To avoid damaging the splines on this part and the final drive, the output flange must be heated to 100 degrees celsius prior to fitting and removal. Please allow time for delivery as we may need to remove one.