the OEM GSR as well as the ITR front swaybar was 24mm's. So you can just find a used one in diffrent classifeds, junkyards ect, or you can go to honda. Remember you need the d brackets and bushings too.
For the 22-24 mm adjustable, I am not sure. Comptech makes an adjustable one, but I think it is comprible to a 22mm. Progress might make one in a 23mm in the compition line, but there normal one for civics is 22mm. THe USDM ITR rear sway is 22mm and the JDM 98spec ITR one is 23mm. Consider that option as well