For anyone who wants to be perfectly period correct, I have two diapers that fit around the gearbox of the RT-4 providing an aerodynamically clean shape. Unfortunately, to install or remove the axles have to be disconnected. They are fiberglass but quite large. If anyone wants them (1980 - 1982 cars with outboard rear suspension) they are theirs for the shipping. If not, they go in the skip next week.