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What year of truck?
I don't think there was a difference between AC and non-AC on the 95+ trucks. Maybe internally but they are both the similar as far as engine bay footprint.
You won't find a new one unless you happen upon a NOS one for a 83-94 somewhere, JY is your only decent bet. I don't know if the herd is getting that thin or if the don't make enough off of them and they go straight to the crusher but non-ac stripper models are getting fewer and farther between at the JY's I go to. I don't think I have bumped into another non-ac truck since I got my non-ac box 3 years ago.