We don't have anything for that. On a one-off project, I would start with a Lakewood bell housing. (Assuming the depth is too great.)
Cut off the face that meets the transmission (after having the machine shop locate the center of the hole relative to the locating dowels). Weld on a new rear face, reface the mounting surface, and machine the hole for the Porsche transaxle. Piece of cake...
Cut off the face that meets the transmission (after having the machine shop locate the center of the hole relative to the locating dowels). Weld on a new rear face, reface the mounting surface, and machine the hole for the Porsche transaxle. Piece of cake...