Problem installing the 84-006 roller

New problem. I attempted to insert one of the spring roller units in the bottom rail of the door and encountered a problem. Never could get the leading edge (with the pin) of the unit inserted far enough so I could place the curve on the unit into the channel of the bottom rail. Something was stopping the unit from going in far enough (I even tried it on the other side with the same result). Seemed like the pin was too long and preventing the unit from inserting all the way. When I attempted to press on the curve to get it into the channel, the pin broke off. So, maybe this is not the correct unit for this door

Thanks for your response but, unfortunately, I did not receive a response from your research team