I have rebuilt the cylinders on my 51 loadmaster and all of them are working good except one. The rear passenger side wheel. The seal keeps blowing off. so i have opted to by a new one. I cant seem to find the exact one i need. The one i need uses the main brake line in the has the small break line jump to secoundary wheel Cylinder. here is the part number i have :# 5453825 AC Delco.