The early (W108), boxes themselves, are basically the same design except the some gear ratios and top covers which can be switched. The later W108 manuals, switched to the side-cover-shifter transmission and it is quite different. These side cove units are not usable in a pagoda. The W111, W112 manual transmissions are good substitutes. With the floor shift versions of these sedans and coupes, even the floor shift lever parts and top transmission covers are usable. Consult the BBB or Technical Data Manuals for the exact gear ratios in all these transmissions.