Who knew seatpost binder bolts could be so exciting? Anyway, I got the one from the bag to engage, but only for a thread or two. It is a no go. Here is a side to side comparison. If you look at the keyed side, the original is 4mm longer from the key to the other end. It is 11mm from the key/14mm from the inside of head to the other end. If you need another one, look for one with those dimensions.