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you want the width not the depth right? If that is the case I think you have found the narrowest one. (not sure about the PA 120.1 though)
EDIT : Of course you do know that the difference between the majority of 120mm radiators is around 10mm or less. So you aren't talking about much variation. I think the HE is 124mm, PA 127, BIP and BIX are 133