Heater control knob for Peterbilt 330 357, 3PCS AC climate speed mode knob1、OE Number: The referencing oe number of this AC heat control knob are 121 0001 000, 1210001000, 702‑5401, which is molded and designed depend on the original data. 2、Fitment: The AC heater control knobs are replacement for Peterbilt 330 335 357 367 375 378 379 384 386 387, please check the model of your vehicle before ordering to confirm compatibility. 3、Easy to Operate: The knob is reasonably designed, the press is smooth, the use is simple, the rotation is easy, and the control is precise, making the adjustment of the air conditioner more convenient. 4、Excellent Material: Made of high strength ABS materials, wear resistant, corrosion resistant, able to maintain durability in various harsh environments, and serve you for a long time. 5、Ideal Replacement: Direct replacement installation, meets or exceeds OEM standards for the replacement of old and damaged one on original vehicles.