Homelite Ryobi Part 099958001031 used in models HGCA4500 4500 Watt Portable Generator, HG5000 5000 Watt Portable Generator, HGCA5000 5,000 Watt Generator, UT9C5000D 5000 Watt Generator HOMELITE RYOBI 099958001031 GENUINE BACK SPRING REPLACES ALSO USED ON RIDGID TROY-BILT ECHO POWERSTROKE WORKFORCE BLACKMAX