I just recently did it for the Devious Devices + High Heels System conversion for Fusion Girl (some 63 different outfits if memory serves), which was previously made for FG 1.45 and I updated to FG 1.75+. It's really not that complicated: Find the old conversion in BodySlide Click the button to open it in Outfit Studio If there's a reference body included, delete it Import a new reference body In the bones tab, select L_BreastSkin and R_BreastSkin, then right-