hey guys. i have a 78 free spirit RV and the wiper ARMS are totally shot. i have called everywhere i can and google searched until my eyes were ready to pop out. i also tried auto zone and jc whitney. do you guys have any suggestions for where i can buy the arms? i dont have an exact measurement on the lenght right now, but i can get it later today. any help would be greatly appreciated!!! the arms slip onto the motor shafts and are help on with a large cap nut.