Paul, M30 comes back to a Axis mixer, not Univex Could you confirm the full model number or brand?
Is your control panel like this?
Now if you have a SRM-30, that would be a Univex.
Regaurdless of which one you have, you can go to Partstown.com, At the top of the page is a box that say’s to enter part number or keyword. Enter your model number and it will come up with manuals to find your gear. You can then enter the part number of the gear you want in the same box.