Technical 1955 Chevy 6400 first edition

I need a replacement spring for the stock Pcv valve or a replacement unit, 261 c.i. I checked all the usual sources and haven't had any luck. Help guys

 

I'm confused about your request as pcv valves didn't come out until the early/mid 60's.

 

^^^^^^^^
Quite a few larger vehicles have been equipped with PCV valves since the '30s. Only, instead of PCV, they're known as Donaldson valves ….

 

There were kits made to install them back then usually from California,I have found they were installed in WWII trucks that were driven through water.