Here are more pics. The step is 22" deep with 32" overall in center, making 10" curve. Measuring center line of old support holes, at transom:30.5. 29.5. 29.5 30.5. You have 3" on each side in center 3 support areas. Outsides are closer to 6". Referring to solid areas. SB side has a small pad from old ladder. Larger pattern holes closer to transom are from an old dinghy davit.