Rack Attack Vancouver worked really hard at resolving the issue and thank you for that. I have to admit that I am not impressed with Thule who sold me a tracrac saying that Thule, Tracrac, and Yakima accessories were compatible with my rack when in reality nothing fits with my model. Rack attack Vancouver ended up having to scramble parts of three years old accessories and were able to send me used load stoppers with two knobs missing. I am now hoping that the knobs that I ordered on Amazon will fit, 6 weeks after I bough the rack finally. It's been an issue for me as I need to put three ladders on my rack every time I go to work, without load stopper it makes it a pain in the butt. If I could have known, I would have not purchase a Tracrac. Thanks Rack Attack Vancouver No thanks to Thule and Canadian Tire, know before you talk!