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are they all the same in terms of bearing size?
No, you need to measure the OD, thickness and both chamfer angles. The 1.5" lowers don't vary much, but there are loads of possible 1.125" uppers and only one of them is the right one. Once you have the dimensions, go to the TH Industries web site to get the part numbers and google those to find suppliers.
gbj_tester
Is there a headset thread? I've an integrated tapered (1 1/8 to 1 1/5") headset that needs replaced - are they all the same in terms of bearing size?