Cylinder Head Stud Kit. 23 x Head Studs. 23 x Stud Nuts. 23 x Spring Washers. MAYHILL TRACTORS PART NO: 9806. (Please quote when contacting us). All Major Credit/Debit Cards Accepted. Please Note: The benefit of Mayhill Tractors is we hold thousands of items in stock available for same-day dispatch! OEM Part Numbers: Please note that OEM Numbers are for cross reference purposes only and do not imply that original parts will be supplied (unless stated).