I was working on my rear wheel the other day and checked my cush rubbers again. They looked fine yet one obviously had worn enough that the aluminium insert was starting to touch the rim. So I ordered 2 sets of cush rubbers. The part number for the standard ST's is for a kit of 5 rubbers. The part number for the Police is for a single rubber. That I think explains the difference in the part numbers. Buying Police rubbers as units is way more expensive than buying the kit of 5. I paid just under AUD $55.00 for each set from my local Honda shop.
The old were quite loose. I cleaned up the rim changed my wheel bearings and put my new cush rubbers in place. I was very surprized at just how much tighter the new rubbers are. I think Yorkie was really close to spot-on when he considers changing perhaps every tyre change. If only we could purchase them at a better price.