One pair (2 pieces) of 8 inch high quality foam speaker surrounds - these can replace a deteriorated foam surround so your speakers will work just fine for many more (15-20) years.
These 8 inch surrounds are designed to fit on these Acoustic Research woofers (pls check the picture for the great fit on the AR16):
Replacing a surround is not that hard - it's a job that needs your full attention but then everything will work out just fine. Because the gap between magnet and coil is pretty tight we recommend you use the 'shimming method' when repairing this woofer. Don't know what it is? We have a repair manual online free of charge, send a message for the link. eBay won't allow us to use hyperlinks here.
I will pack the surrounds very well so they will reach you just fine. Beside these surrounds I also have rubber versions and I have other sizes available. Check my Ebay shop or contact me.