Millermatic 200

Pull the three screws out of one and flip it over. It will have the size of the other groove stamped in it. If you are lucky you will have the other size you need already. I looked and sis not have any old ones that size laying around. Computer does show 1 new set in stock at my main store. (I will have to have them check that to be certain) $25 plus the ride to you if I really do have them and you need them.