I used the OEM classic LT mounts. I put a little lipstick on the studs. put a towel down to protect the pipes and set a 1x6 on the pipes. I set the bag on the 1x6 and the lipstick transferred the exact hole pattern. Drilled one bag and put the bags back to back to drill the next one. My MU bag have lights and I wired them under the seat. I love these bags for the price. 260.00 for the pair + shipping.hope this helps!!