Mounting Bolts CTC is 2-7/16" for 134 engines only. Note: New carbs are not adjusted to new specs due to age and wear variances of tractors, may need to adjust mixture, idle, and float adjustments. 
Part Reference Numbers : 312954, B8NN9510A, TSX765, 1103-0003,S.115161
Model : Ford/New Holland - 2000 Series 4 Cyl 62-64, 2030 4 Cyl, 2031, 2110TR 4 Cyl, 2111, 2120 4 Cyl, 2131, 4000 Series 4 Cyl 62-64, 501, 541, 601, 611, 621, 63-64, 631, 641, 651, 661, 671, 681, 701, 741, 771
Shipping Weight : 4.3 lbs