Lower Structure Support for Gen III Hemi Engines and Transmissions Fits Gen III Hemi Engines and Common Mopar Transmissions Use with Swap Oil Pans, Fabricated Oil Pans, and Stamped Pans (that Do Not Provide the Extra Support) HolleyMost Late model factory oil pans bolt to the engine block and the transmission for extra strength and support. Most swap oil pans for the Gen Iii Hemi do not have this additional support, but it can be added using Pn # 302 65. This lower support fits cast, fabricated, and stamped swap pans on Gen Iii Hemi engines with popular transmissions (or bellhousings). The lower structure support also covers the bottom of the transmission (or bellhousing) to