| Also known as | AA26H |
| Listed in parts books | Not catalogued by year yet |
HEAD GASKET M20/21 SNDWCH
A sandwich-type head gasket listed for the M20/21, cataloged under Triumph part number 66-0058 (formerly AA26H).
This is a head gasket listed under Triumph part number 66-0058, also known by the older AA26H reference. The catalog description ties it to the M20/21, which is not a Triumph designation, so this looks like a part that crosses over to another marque's engine rather than a Triumph twin head.
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The description notes it as a sandwich-type gasket, meaning it is built up from more than one layer or material rather than a single sheet. Beyond that, our record on this one is brief, and we don't have appearance history across other catalog listings to lean on for more detail.
Given the M20/21 reference doesn't match any Triumph model, and the entry is thin, call the shop and we'll confirm exactly what this gasket fits before you order.
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