If you can measure what you want, wolff may have what you want on the shelf.
Wrote to gunsprings.com (Wolff) and gave them the minimum internal diameter, leangtb and weight. Got the following in return:
"I wish it was that easy. Finding a spring to fit and function would be a time consuming proposition which is cost ineffective. I’m sorry but I don’t have the time or resources to help you with this one."
So bottom line: Not worth their time and effort.
Update: I had e-mailed LaserMax yesterday and I didn't want to be too pushy by calling the very next day... but I did just that.
The irony: LaserMax is going to confirm the black-to-green P220 spring weight change with Sig on Monday. Once they confirm the specs of the new green spring with Sig, they're going to contact Wolff, who makes all their springs for LaserMax
, and have a batch made up for the new stainless slide Sigs.
So it looks possible that I might be getting a couple Wolff springs after all!