The Model 37 Deluxe Slide tube features a flat square rear and a bar Heliarc welded to the tube. This tube has been on Model 37 “Deluxe” versions with the tube recessed inside the wood. ****Different years of manufacturing require different lengths of the tube. To ensure proper fit, please refer to the length descriptions before proceeding. The out-of-stock parts can be made by Ithaca, but require the actual wood forend, original tube, and nut to be sent to Ithaca Service for proper fitting.