The Cal Royal Products 900 Series Door Closer is a unique one, it is the only closer that has the 3/4" x 11-1/8" hole spacing. We have seen a few versions of this closer, some have 6 mounting holes, and some have 4. If your closer has a spacing of 11-1/8", and has 3 holes on each size, this is the only closer I know of that is like that. The 900 Series is a Grade 1 closer, the heaviest duty rating possible. The door closer has adjustable spring tension, closing, latching and back check valves and is Barrier Free rated. The package comes with all of the mounting screws and a parallel arm bracket, so it can be mounted on the left, right, push, pull or top jamb for mounting.