A Porsche 914 & 914/6 Authenticity & Restoration Resource.

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Hella Lamp Comparison:
TN1-TN2 & TN4







TN1-TN2 (1970 - 1972)



TN4 (1970 - 1974)



Bosch (1975 - 1976)


Porsche 914 & 914/6 Fog / Driving Lights

Bumpers Are For... Supplemental Illumination.

Porsche offered fog/driving lights as an option on the 914 series: round Hella lights for the 1970-1974 model years and rectangular Bosche lamps thereafter. The round Hella lamps initially came in two styles for US specification vehicles: those with Hella TN1-TN2 lenses and the more prevalent examples with Hella TN4 lenses.

All factory Porsche 914 fog lights are mounted behind the front bumper and shine through cutouts in it (1970-1974 models had chromed plastic or painted plastic fog light surround grilles that also served to mask the horns). The mounts pivot to provide a level of adjustment. At right are comparison pictures of the two types of 1970-1974 Porsche 914 lights & components meant to highlight the differences. Each of the two round Hella styles is separately described in more detail below.

Current eBay listings for Porsche 914 and 914/6 fog/driving lights (compare listed items with those pictured on this page to ensure authenticity):

Porsche 914 and 914/6 Fog Lights on eBAY

Hella TN1-TN2 Fog Lamps: 1970 - 1972

The Hella TN1-TN2 fog light was available on the 1970-1972 Porsche 914 model years and the Porsche 914/6 models. They are round Hella lamps comprised of a semi-gloss black housing attached to the mount base with four unpainted brass rivets, a gloss-black painted brass trim ring, a reflector dish, a light diffuser, a 35 or 45 watt Phillips bulb, a 110mm Hella TN1-TN2 lens, a lens gasket, four wire lens clips, a wire grommet and a ring retainer clip (with screw). The lens has a horizontal offset about one-third the way up the vertical fluting. The trim ring is molded to angle the ring face inward. The light diffuser that shields the bulb in the TN1-TN2 lamps is chrome.

Hella TN4 Driving Lamps: 1970 - 1974

The more prevalent optional 1970-1974 Porsche 914 driving lights are also round, 110 mm diameter Hella lamps with the same components as the TN1-TN2 models, but the lenses are the Hella TN4 units which have no horizontal offset. The painted brass trim rings on many of the TN4 lights have flat, unmolded faces. The light diffuser that shields the bulb in the TN4 lamps is unchromed tin. Normal problems associated with both styles of the round Porsche 914 and 914/6 driving lights are lens wear & cracking from road debris, ring paint wear and chipping from same, housing rust and reflector dish rust.

Bosch Fog / Driving Lights: 1975 - 1976

1975-1976 Porsche 914 models were optioned with rectangular fog lights manufactured by Bosch.