[Stocker]

Those hooks are available at lots of places, do a Google search for tow hooks. Walmart has Curt hooks (pictured) for less than $10 and Harbor Freight has a different brand even cheaper. All are rated at 10,000# so are plenty strong, you won't break 'em. I found other places selling pretty much the same hooks but for more money. Oh, you can get 'em in chrome too if you like.