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. Depending on condition, discontinued parts may possibly be repaired by Ithaca, but require the actual wood forend, original tube, and nut to be sent to Ithaca Service for proper fitting.