torc-a-verter

Does anyone know where to buy new torque converter covers that will fit over a 7" driven pully?

Been lurking a while and finally have a question. The old comet belt drive I have won't work with the 5.5hp OHV honda I have. If I could lengthen the frame on the converter the rear pulley/shaft assembly would clear the head and valve cover. Has anyone done this? Will I be able to find a longer...