Found these on the USA Water Ski site. Figured everyone would like to know. 85-86 Hydrodyne O/B 150hp,235hp 92-93 Hydrodyne 20' Inboard Comp 87-90 Hydrodyne 20' O/B 94-96 Hydrodyne Comp XP 94 Hydrodyne Grand Sport 85 Hydrodyne I/O 84 Hydrodyne O/B 150hp Johnson 84 Hydrodyne O/B 150hp Mercury Barefoot Approved Tow Boats: 85-86 Hydrodyne O/B 150hp,235hp 84 Hydrodyne O/B 150hp Johnson 84Hydrodyne O/B 150hp Mercury