1953-1962 Corvette Upper Inner Shaft Issues. Make sure the shaft is correct!

Corvette-1953-1962 and Passenger Car upper inner shaft 1953-1962 Issue

Make sure the shaft is the correct size before you attempt to install it.  Some cheap imported kits have the wrong size indexing threads.  Measurements above are approximate.  However, they must be different to avoid damage to the shock tower.