...or you could buy the parts tree that has the front uprights on it: B parts #50736 and the front kingpins, which are 4 X 11.5 mm step screws- kinda the same as the old FF01-TA01/2 kingpins. Might be easier to just find the ones from the 03R that fit what you've got, but you'll also need the bushings and screws that mate up with the M uprights, as I'm not sure that the TA04 style kingpins will fit the alloy carriers.

BTW, some people think the older front end is easier to drive.