[T2] oil pressure control spring

[Bill Anderson]

I have a 74 westy bus with a semi basket case 1973 1.7 type 4 motor. I am sorting through parts and am missing a spring  on a oil relief valve. Its a big slotted head plug with a sliding piston but no spring in the basket. I found the parts diagram on busted bus and asked if they have it but i wondered if any one could direct me to any teck info on the size, part number or availble springs or even a name for the relief part. Thanks Bill