Dosens C9588 Rocker Box Gasket Kit for Harley Twin Cam 1999–2005 | EST Kit

Overview

Meet the Dosens C9588 Rocker Box Gasket Kit, a complete EST kit built to simplify rocker box maintenance on Harley‑Davidson engines. Rather than sourcing individual gaskets, seals, washers, and o‑rings separately, this all‑in‑one package provides the essential components in a single, ready‑to‑use solution. The kit is designed to align with the original fit and durability, helping you restore a clean seal around the rocker box and support steady engine performance through routine service and inspections.

Designed for practical use, the C9588 kit brings together everything you need for a thorough rocker box refresh. The included parts are chosen for reliable sealing under typical oil and heat exposure, making it a sensible choice for DIY maintenance or professional service workflows alike. Keep in mind that results depend on proper installation and engine condition, and this kit is best used as part of a thoughtful maintenance plan.

What’s Included

• Rocker box gaskets
• Seals and o‑rings
• Washers
• Additional hardware as required for a complete gasket EST kit

Compatibility at a Glance

This kit is suitable for a broad range of Harley models. It covers 1999–2009 Electra Glide Standard, 1999–2013 Road King Classic, 1999–2014 Road King, 2000–2003 Heritage Springer, 2000–2014 Fat Boy, 2004–2007 Road King Custom, and 2010–2014 Fat Boy Lo, plus 2012–2013 Switchback. It also supports 1999–2005 Harley Twin Cam models, including Electra Glide (FLHT), Street Glide (FLHX), Dyna, Softail, Road Glide (FLTR), and Road King (FLHR).

• 1999–2009 FLHT Electra Glide Standard
• 1999–2013 FLHRC Road King Classic
• 1999–2014 FLHR Road King
• 2000–2003 FLSTS Heritage Springer
• 2000–2014 FLSTF Fat Boy
• 2004–2007 FLHRS Road King Custom
• 2010–2014 FLSTFB Fat Boy Lo
• 2012–2013 FLD Switchback

• 1999–2005 Harley Twin Cam family: Electra Glide FLHT, Street Glide FLHX, Dyna, Softail, Road Glide FLTR, Road King FLHR

Why choose Dosens

Dosens focuses on practical, motorcycle‑ready parts designed to fit the way Harleys are serviced in the real world. The C9588 kit’s all‑in‑one format can help streamline your workflow, reduce trips to the parts counter, and support a thorough rocker box refresh. While not a guaranteed outcome, many riders appreciate the clarity and completeness this kit provides when planning a maintenance session.

• All‑in‑one convenience for rocker box service
• Engine‑specific fit for Harley Twin Cam platforms
• Designed to withstand typical riding conditions and heat exposure

When you’re ready to service a Harley Twin Cam rocker box, the Dosens C9588 kit offers a practical, ready‑to‑use solution that keeps you focused on the task at hand rather than hunting for separate components.