Storm door handle

I have contacted you before on this issue where the latch was not springing back in place. You suggested the 40-150 handle as a replacement. It was close, but the spindle was attached to the lever on the one I have and it was larger. It was twice the size. However, my real problem was the spring action. the latch on both mine and the one you suggested was the same. I was able to just remove the spring and install it on mine and it works fine. What I now would like to know is if I can buy just the spring? It is the same spring as on the 40-150. I would like to have a spare or two.

Thanks,
Bill