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Dave at Pelican Parts Dave at Pelican Parts is offline
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Sorry, Jim, that's not correct.

The "M" caliper was used on 911s from very early on (at least 1969, probably earlier) through about 1975. This steel caliper had 3" center-to-center spacing on the caliper mounting bolts. It was also used on the 914-6. A 911 catalogue (or 914-6 one) should have a part number listing.

The "S" caliper was aluminum and had a 3.5" center-to-center spacing on the mounting bolts. It was an option from about 1969 through 75 or so, and then became the only option until about 1979.

The "A" caliper was steel and had the 3.5" bolt spacing. It was used on all US-spec 911s from 1979 or 1980 up until the 964 platform (Carrera 2 / Carrera 4) was introduced.

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A few pics of my car:
Old 04-08-2002, 08:48 AM
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