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Easy way to verify is take a 1" wrench and a wire brush with you. Clean the dirt off and see how the wrench fits.
Ive heard mentions of the Explorer rear bar also being 1", but I dont know if its compatible with the ranger rear end..
As far as which BII's came with the 1", my guess is to stick to the 4x4 models. I believe any of them. Mine came off a 89-90 model.
I have 6 4x4 b-II's from '84 to '89 and a '91 exploder. None of them have any rear sway bar bigger than ~ 5/8". I wish I could find one.
Richard