Konstantine, take a look at this shift boot in another thread. I think it might be a better choice than the round peg in the square hole situation you have now.

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1615167/floor-mats-for-4-speeds#Post1615167

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)