Those part numbers are the 3.6 parts. They would bolt onto any M96 motor. The 3.4X51 was not available in the US. It appears to use the same cast intake manifolds as the 3.6 x51 but I don't have part numbers to verify that.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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