This is an NOS Walker Heavy Duty truck muffler to fit 1964-73 Ford HD Truck Autocar, Marmon Herrington &Walter Trucks. It is a completely welded seam muffler. Was still sealed in the box until I opened it for the photos and it is still like the day it was made and WYSIWYG! I have attached pics of the applications and all dimensional info in the last 2 pics. Thanx