The Jeep steering box is made by Saginaw. They come in right and left hand and a light and heavy duty version. Some have three bolt mountings and some four. A four bolt will fit on a three bolt frame. The heavy duty version is in the V8 Durango, which you knew already. A TJ box will also work. The way you tell is by measuring across the end. The larger box will be 4" across. The smaller one will be 3.5"