Arm loose, worn out or damaged? The straight up arm on this particular linkage is usually used on the B, IB, C, and CA model Tractors. Used on the TSX series Marvel Schebler Carburetors.  This is a brand new Marvel replacement piece. 
 
B&B TECH TIP:   If your Carburetor's throttle shaft is loose in the throttle bore, this new throttle shaft will usually NOT improve the looseness out in the throttle shaft. In most cases, the throttle bore wears out before the throttle shaft. The throttle bore will need to be bushed, or sleeved depending on how loose the throttle shaft moves in the bore. A lose throttle shaft will make the engine run lean, by sucking air in trough the lose throttle bore. Take it from someone that rebuilds a lot of customer's Carburetors for their AC Tractors! If the play is excessive, the throttle bore will need to be repaired.