Assassin traction bars

Correct, the transfer bracket requires a locating pin be installed through the leaf. They do seem like nice bars and I wanted them for my truck, but they never responded to repeated requests for info about their product. Made me a little wary.
Talk to Assassin today and they said that there bars are made for a thousand horsepower and if you're running 400 to 500 horsepower no need to drill the hole in the spring. They did say the more the horsepower the better they work they're located in Dallas Texas they sell for $339 plus shipping