Buy the 928-H4-Cap Sealing Cap for Porsche 928 8″ H4 Headlight and Related Items

What is the 928-H4-Cap? See 928-H4-Cap Porsche 928 8″ H4 Headlight LED H4 Bulb Sealing Cap: A Solution to Sealing the H4 Bulb after Upgrading from Halogen H4 Bulb to LED H4 Bulb.

If you have a Porsche 928 with 8″ H4 headlights and two of these:

Photo of generic LUMILEDS H4 LED bulb and driver module

A generic Lumileds LUXEON ZES 4000 lm H4 LED bulb and driver — sold under different brands with only minor cosmetic variations — with the following key characteristics:

barrel of the bulb at the heatsink-side of the three-tab flange measures 22.0 mm ± 0.2 mm in diameter and extends approximately 15 mm from the flange and slightly chamfered for about 4 mm before the threaded, narrower part of the barrel
LED driver module can be disconnected from the bulb (electrical connector unscrews and disconnects)
removable heatsink can be unscrewed and will pass over the LED driver module connector
LED driver module has M3 × 0.5 mm screws fastening the bottom cover, spaced at 56.0 mm ± 0.1 mm along the long edge

This bulb model (formerly available under numerous brand names differing only in minor cosmetic details like color or markings) is becoming increasingly difficult to source. As of 07-Oct-2021, it still seems to be available as Oracle 5231-001.

We do not sell this or any other H4 LED bulbs; you must obtain them elsewhere.

... or two of these:

Photo of Philips 11342XUWX2 H4 LED bulb and driver module

A Philips LED-HL [≈H4] X‑tremeUltinon LED gen2 H4 bulb and driver module; this is Philips product code 11342XUWX2.

We do not sell this or any other H4 LED bulbs; you must obtain them elsewhere.

You will need the extra hardware kit for these bulbs.

... and want a cap and driver module attachment solution that looks like this:

Photo of 928-H4-Cap-22 with LED driver module attached

... then you will need this:

928-H4-Cap-22 Kit A (pair of 928-H4-Cap-22 caps, with brackets and standard hardware), $65.00 USD
928-H4-Cap-22 Kit A Installation Guide [as separate pages | as a side-fold booklet]

The cap kit includes:

2 ea. 928-H4-Cap-22 cap designed for H4 LED bulbs with 22 mm barrel, assembled with seals and vent;
4 ea. 80°-angle aluminum bracket;
8 ea. M3 × 0.5 mm, 12 mm long, button head, hex drive, zinc-plated steel screw;
8 ea. M3 × 0.5 mm hex, zinc-plated steel nut;
4 ea. M3 × 0.5 mm, 8 mm long, button head, hex drive, zinc-plated steel screw; and
1 ea. 2 mm hex L-key.

The included hardware is sufficient for use with generic LUMILEDS H4 bulbs and driver modules.

The H4 LED bulbs are not included!

Choose a documentation delivery method:

Current batch has sold out. On-line ordering will be re-enabled when more units are available.

928-H4-Cap-22 Kit A / Additional Hardware for Use with Philips LED-HL [≈H4] X‑tremeUltinon LED gen2, $5.00 USD
928-H4-Cap-22 Kit A Instructions for Additional Hardware for Use with Philips LED-HL [≈H4] X-tremeUltinon LED gen2 [as separate pages | as a side-fold booklet]

The additional hardware kit for a 928-H4-Cap-22 sealing cap pair includes:

2 ea. vinyl bulb barrel ramp tool;
4 ea. straight aluminum bracket;
4 ea. M3 × 0.5 mm, 6 mm long, button head, hex drive, zinc-plated steel screw;
4 ea. M3 × 0.5 mm hex, zinc-plated steel nut;
4 ea. M2.5 × 0.45 mm, 10 mm long, pan head, Phillips drive, zinc-plated steel screw; and
4 ea. zinc-plated steel washer for M2.5 screw, 2.7 mm ID, 6 mm OD.

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Last updated by EJS, 10-Oct-2022