The best solution is one that mounts the filter on the engine. All of the forces are the same then. Not that I have had any complaints with the clamp-on (upper frame rail) type, but as I recall, one of your 235s has that upside down L shaped boss. Are those holes threaded? What bolt size? I will send you a free adapter plate if you can get me a cardboard template. None of my engines have that.
