I have the shown oil bath air cleaner made by United Specialties that I have pulled down from a sale attempt on FB. I am very interested in knowing what this fits as curiosity now has the best of me. It is very similar to what is used on the MM ZT machines but the mounting bracket is completely different. That said, the dimensions are rather close (I have the MM tractor to compare it to). The air inlet and outlet (to carb) are both 1 3/4" therefore I don't believe the engine will be a large C.I.D. unit, possibly a power unit too. Black is the original color of this unit as well. If anyone has any information they would be willing to share, I would appreciate it. Thank you for your time and please let me know if you have any questions.