Thanks, walterhvogel, but I'm working on the door that has the outside handle. I think your spring is for the door that has the inside handle.
Well that's a horse of a different color, and different side! I will humbly bow out of this discussion, but not before posting a link to a kit for the door handle button:
https://oldchevytrucks.com/dp105k.htmlYou might have to buy the kit to get this spring, assuming it's the right spring, and if this no-lock kit uses the same spring. Maybe hit up your local hardware store and see if they have something that could work.