The PO case designs are all very similar depending on lug width and watch size. So, a bracelet will fit both the 42mm 2500 and 8500, with the noted exception of the end links being slightly shallower / deeper top to bottom depending on movement. So, if you use a 2500 bracelet on an 8500 the end links will sit a bit inward of the top and bottom edges of the lugs, and conversely the 8500 bracelet on a 2500 will site a bit outbound of the lugs. The end links ARE different between the 8500 and 2500 bracelets, but they will fit either model.
Another difference between the bracelets on 2500 and 8500 are the removable pins - 2500 is push pin with collars while the 8500 is pins with screws. There are pluses and minuses with each system, and the choice completely based on personal preference.
The SMP bracelets WILL NOT fit a PO, either Bond or Speedy. Lug hole to case distance is drastically different, and the case diameters and curves are also not the same. I can't think of any modern "Speedy Style" bracelets that work with the PO.
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