Ithaca model 72 magazine tube for 22 magnum

Mag tube for Ithaca lever action in 22 magnum.  From what I could find the model 72 in magnum came with 18 1/2" barrel but this tube would be for a rifle with aprox 19 1/2" barrel.  Tube diameter is. 375" and can not be used in standard 22 long rifle.  40.00.  Tracked shipping available for 25.00