Stemco Hub Cap 340-4024 Includes Gasket! Stemco Hub Cap 340-4024 Volvo Part Number 858381 Replaces Volvo 1027518 527502 527503 891033 Bolt Circle: 4.5 Bolt Size: 5/16 Overall Depth: 2-5/8 Inside Depth: 1-7/8 Flange Inner Diameter: 3-1/2 Flange Outer Diameter: 5-1/4