I'm not going to lay down in the snow to get pics for you today, and the diesel may be different than the gas engines, and I suspect there's some difference between a 20 and a 30. So, two observations on prior posts.
1- The OE setup on mine had 2-1/2" pipes before the muffler, and 2-1/4" after. Seems like that was not just the diesels.
2- The original mufflers had a bracket welded on the back that a metal tongue was attached to that fit in a hanger behind the muffler. The fronts have a regular bracket. Since the mufflers with the bracket are NLA We added an attachment point on the rear clamp to hold the tongue thingy.
Hope this helps. If you need pics of mine, which is still pretty much the OEM configuration you'll have to wait for better weather.