but it says "the 6:00 position would put the two wire harness connector in direct interference with the 'main mounting bolt,' and so it's possible that no passenger cars used SI series with 6:00 positioning." .... so maybe yours was 're-clocked' to suit your application, but it does give the AC-Delco #321-135, which should be listed at the parts houses [or via the Lester #7127-6] ... or you could use any of the other applications with different clocking and re-clock it yourself, they're all the same operationally
Bill