Here's the part numbers on the collars. Hope this helps.
www.mcmaster.com
Just tap them and thread in the ball mount and they are good to go...the fronts you have to shorten the ball stud a little so its flush on the inside but the rear is perfect. These are the part numbers if you have the Porterbuilt control arms and trailing arms. These are aluminum so you can polish them too.
Part# 6436K74 2 Each Two-piece Clamp-on Shaft Collar, Aluminum, 1-1/4" Bore, 2-1/16" Od, 1/2" Width
Part # 6436K76 2 Each Two-piece Clamp-on Shaft Collar, Aluminum, 2" Bore, 3"outside Diameter, 11/16"width