115 and 123 chassis do use a different oil filter housing, but if you have the room under the hood it should fit. When the 123 chassis came out it was the first or close to the first to use the "new" universal arrangement, alt on right, a/c on lower left, ps upper left and so on. The 115 has different mounts for those devices. I do believe that there are mounting bosses that are missing engine from engine. Trans should mount with no problem. You engine shut off I believe on the 115 chassis is the old mechanical style? You may have to modify your ignition switch to accomodate the vacum shut off or just swap out the pumps.