The 8500 and 9500ss are not the same drag system. Your 8500 is supported by Smooth drags. At least they have the smoothies. I would either use the stock Penn HT-100s or Carbontex. Lightly apply some Cal's grease.
I had to do a little digging when posting my answers. I try to ensure that I am not misleading anyone when I post about reels.
I found that I had some parts that I had forgotten about.
I have two... stainless steel, 12 tooth, anti reverse, ratchet gears. Brand new. They fit Penn 7500ss and 8500ss reels. These are custom made parts that double the number anti reverse stops over a stock, brass ratchet.
i think the teflon drag washer is the same size as a #6-60 penn ht-100 carbon fiber drag washer. i'd just use one of those and slap a coat of cal's grease on it. the drive plate is no longer available from penn. pennparts.com has a conversion kit for $40. if the drive plate you have is already carbon fiber, take an old rag, rub out some of the old crud, slap a thick coat of cal's grease on it and put the reel back together. if you're lucky, you'll be into this for $1, not $40.
the teflon washer (key #56T) is underneath the drag knob (key #52). you have to pull off the spool, remove the retaining ring (key #51) and the keyed metal washer (key #57). to check the main drag washer (key #117), you have to remove the drag cover (key #47C) located on the underside of the spool. just slap a coat of grease on it and throw it back in. don't worry about the excess. it will just squeeze out the sides and add more protection for the drag washer. alan