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Two part? Single Assembly! It's all fastened together. Looks like yours was cut in the inside middle if I'm looking at the picture right. Folks will do that if they have trouble with door alignment - it give you a little more flexibility.
My spring has long since been installed ; and has not come off since. Not sure why you are having trouble with yours coming off; other than my spring looks slightly different than what you have:
I took this picture of mine this morning , as I have been driving the truck until it snows again.
The original spring is the one I installed. I bought an extra one for future at a local supplier. Don't know if any of the after market houses carry them or not. Also try web search.
I checked there and it is exactly like the one on the right. tip49 would you be willing to grab me 2 or ? Or give me the name of the supplier as all I can find is the one on the right