Bruce
You don't list a UT Number for the saw but I looked up the Part
and the Tree Spikeis still available as Part Number A12272D, Old Number would have been A12272C. You might check with a Homelite or John Deere Dealer near you. But Homelite has sold its consumer line once again to Tech Tronics Industries Co.,Ltd of HONG KONG. John Deere did keep the Commercial Line however.
Hope this Helps Jerry