Actually, they are called "R" hooks...cost about $6.00 apiece(see SNAPPIN' TURTLE catalog which you can get by calling the number listed in Tony's post)...I use a total of 4, rotating each one into the oval slots designed into the frane at all 4 corners. I personally recommend having 4 "R" hooks in each Viper..coupled with a 6,000 lb. tow rope. One can use the hooks and rope to secure the Viper to the winch hook on the flatbed, thereby AVOIDING some of the damage that's been reported to the bodywork.