Another graphic by John Mytton just to reiterate the point he already made. Oswald ordered a C20-T750. That was Klein's catalogue number for a Carcano packaged with a scope. In January of 1963, they were offering the 36 inch model under that catalogue number. In March, when Oswald placed his order via mail, they no longer had the 36 inch model in stock. They were offering the 40 inch model under catalogue #C20-T750. Oswald ordered a C20-T750 and that's what Klein shipped to him.
Oswald ordered a C20-T750. If we assume that Oswald is indeed Hidell, then, yes he did.
That was Klein's catalogue number for a Carcano packaged with a scope.Again, correct, but not complete. The devil is in the details. The order coupon (as well as the envelope) were addressed to Dept. 358, which told Klein's that the order coupon came from the February 1963 issue of American Rifleman, in which the 36" MC rifle was advertised.
Klein's had no reason to send a 40" rifle which were not even advertised until April 1963.