Comparison : Item # 258350, 3/16"(3/8"-24) Female Invert Flare x 5/16"(1/2"-20) Male Invert Flare Master Cylinder Adapter
Item # 258303, 3/16"(3/8"-24) Female Invert Flare x 3/16"(9/16"-20) Male Invert Flare Master Cylinder Adapter
Item # 258340, 3/16"(3/8"-24) Female Invert Flare x 1/4"(7/16"-24) Male Invert Flare Master Cylinder Adapter
Item # 258430, 1/4"(7/16"-24) Female Invert Flare x 3/16(3/8"-24) Male Invert Flare Master Cylinder Adapter
Item # 258403, 1/4"(7/16"-24) Female Invert Flare x 1/4"(9/16"-18) Male Invert Flare Master Cylinder Adapter