You want repair catalog R-1056E. Your tractor has the front axle with the tie rod out front and the two piece rear wheel centers. According to R-1056E the two piece wheel centers (hub #10B1163) were available for 30" wheels starting with first 1949 UTS. Be sure to get the "E" suffix catalog as the R-1056B level does not have the two piece hubs yet lists the same serial number range (334001 and after) on the cover. Based on this data it appears your tractor was built between 1949 and mid 1951. They changed the front axle at serial # 01205554 in mid 1951 production based on the data contained in repair catalog R-1115A which covers the late UT series prior to the U Specials.