The newest rubber straps that Omega makes for the PO series is the nicest they've ever done, however that increased quality comes with a matching price.
FYI, the inner case diameter and lug hole to case dimension hasn't really changed at all from PO generation to generation, so with the 2nd gen to 4th gen straps with the curved/fitted ends as long as the lug widths are the same the straps should fit between generations. The only real difference in the fitment at the lugs is how much rubber will be above/below the lugs, as the case and lug heights vary depending on movement inside. So the 22mm wide 2nd gen straps for the cal 2500 will fit the 22mm wide lugs of the cal 8500 and cal 9300, but will sit a a bit inside the top and bottom of the lugs due to the thicker cases of the 8500 and 9300.
Since the 43.5mm POs have 21mm wide lugs you'd be looking at either the current straps or the ones made for the previous-gen PO GMTs.
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