Speed Feed Spring Cap for 375 & 450 HeadReplaces (OEM): Shindaiwa 28820-07380 & X494000280 Fits: R13375 - 3-3/4" Trimmer Head Speed Feed 375 R13377 - Trimmer Head 450 Speed Feed replaces Shindaiwa 78890-21001
Speed Feed Eyelet for 375 & 450 HeadReplaces (OEM): Shindaiwa X475000050, 28820-07340Fits: R13375 - 3-3/4" Trimmer Head Speed Feed 375 R13377 - Trimmer Head 450 Speed Feed replaces Shindaiwa 78890-21001
R10638-BUMP & FEED TRIMMER HEAD FITS STIHL W/ 10MM X 1.0 LHF