Gasket Part Number: 330-3118 Included. The “HP” means parallel spindle. This is the larger spindle commonly in use where both inner & outer bearing sets are the same, SET415. When it comes to semi trailers, there are basically only two bolt-on hub cap sizes in use: The smaller HN spindle hub cap & the larger HP hub cap listed here.
Stemco Hub Cap Gasket 6.75in BHC
$2.92
Universal Fleet Standard 6 Hole Gasket for 340-4195