The Sage has limb pockets, ie, plates on the side of the riser to hold the limbs in place, I believe the impala has the locator pin in the bottom of the limb. It would be an easy fix to put the pin in the limb, pm me if you have any more questions or if I can help. I have put several sets of Samick Sage limbs on compound risers Ihave reworked to end up with a cheap/dependable entry level bow for newbies. I use various older risers that I get for free or less than $10. The sage limbs are very nice for the money, shoot hard! Sam.