Hi I am new to this forum.I am currently swapping my pro action skid with a sc10 111.I bought the doo skid without all the wheels so I will be using the original Yamaha ones.If you remove your idlers wheels they should have a plastic washer pressed into both sides of the idlers.Remove the plastiHopec washers and there will be 6204 bearings in them.They can be used as your idlers in the doo skid.For the rear I have the 4 wheel setup on the proaction skid.To install these on the doo skid all I did was remove the upper wheels on the proaction skid they will have 6204 bearings also.Install these wheels in the middle with a spacer machined the same wjdth as original and then machine the ends of the doo shaft for the outer yamaha wheels.This will get rid of those yellow wheels amd make your sled look original.Hope this helps anybody considering it
