I just went out to measure my pan and it, too is 9 3/4" and 15 3/4" and it's a 3 speed transmission. So it's the same spacing as your housing holes.

Who knows what that pan you have is supposed to be for?

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)