COG has a quiet program that may be able to pick up a number of these springs to hold as reserve "inventory". COG won't sell them directly as they must be considered "Owner Provided Parts". But COG can help with the acquisition expense to reach a cost effective min ordering quantity.
It's one of the older units. I think I paid $1400 for it.
After looking through emails and such I don't think I have the model number available. It'll have to wait until I get the airplane back, which will be a few weeks.