might be hard, as I do not recall every seeing a trailer type MF sickle mower,
best bet, contact your local MF dealer with the machine model number and ask them
machines that few were made, replacement parts might be hard to find.
best bet with an old MF mower, buy a used one as a backup for hard to find parts.
the casting that holds the two belt pulley shafts on my MF32 mower is busted, lucky for me I had a good friend with great welding skills, he was working on another big braising project in his shop, said if I would take the casting off, while he was working on the other project and had the tools out, he would brass weld my casting. I had little to no faith it would work, but it was free, many years later it is still holding together. he did great work,