For the last year or two I've been talking to Victor Korves about producing springs for the Plowmaster 100. It is a pretty common request. I have some NOS parts that I've been trying to bring to one of our events for them to use as patterns. Unfortunately, many times I've been using airlines for travel, and when I do drive, somehow with the other issues concerned, at the last minute those parts don't seem to find their way into the pickup. I'm still working on that, maybe I can remember to load them to go to Springfield. If the spring I think you are looking for is the same, and most of those are, I think Korves is considering doing reproduction.