For those of you who need a simple non-WD hitch, or a spare, Princess Auto has the tri-ball (all three sizes) on sale right now for $18. It's not showing on the website, but it's happening at the Calgary NE store for sure, on a pallet up front by hydraulics.
Like this one, but different brand: http://www.princessauto.com/en/detai...nt/A-p8493066e

Very handy to have around, and much cheaper than buying three different balls and one shank.