Are all J180 Hinge Mount Alternators the Same?

The answer is No! There is a J180 short hinge mount and a J180 long hinge mount. The short hinge is what you would find on Delco alternators and the long hinge is what you would find on Prestolite Leece-Neville alternators. To determine whether you have a Delco short hinge mount or Prestolite Leece-Neville long hinge mount alternator, measure the distance between the bolt holes on the front frame of the alternator. If the distance is 7.79” (198mm) it is Delco and if the distance is 8.50” (216mm) it is Prestolite Leece-Neville. If your engine has a fixed mounting you must replace the alternator like for like. If your engine has an adjustable bracket then usually the Delco can be replaced with a Prestolite Leece-Neville and vice versa.