Did you recount the number of leafs at the perch? If the pictures on Summit are correct, then they both have 5 leafs. The bottom leaf on each spring looks kind of like a half leaf. The difference being that "half" leaf points forward on the 863 spring and points rearward on the 864 spring. That can be deceiving when counting leafs as I said earlier. My P3412002 (right) and P3412003 (left) have that same design. The right spring (002) has that half leaf pointing forward same as the 863 picture I see. So I am still thinking your 863 spring goes on the right side as you have it. Take a look and tell us what you see.
