You will need a new spindle assembly PN 1001200MA or its after market version. You can get a pair of the aftermarket for around $40. And you will 5ea per spindle 3/8-16 x 1.25 self tapping bolts if the spindle you are not already tapped and if tapped then regular 3/8-16 x 1.25 hex screws.
Be careful as there are a couple different versions out there in the after market,