[Vehicle Fitment-1]: Compatible with Peterbilt 320 1987-2000 --- It fits the model with Split Progressive Spring Suspension
[Vehicle Fitment-2]: Compatible with Peterbilt 320 2001-2018, 357 1986-2007, 365 2008-2018, 367 2008-2018, 375 1987-1996, 377 1987-2001, 378 1988-2007, 379 1986-2007, 387 2000-2001, 389 2008-2018, 520 2017-2020, 567 2014-2020, 579 2013-2020, 587 2011-2018 --- It fits the model with Tapered Leaf Springs and Set Forward Axle
[Vehicle Fitment-3]: Compatible with Peterbilt 376 1988-1991, 376 1995, 384 2008-2015, 385 1996-2007, 386 2007-2016 --- It fits the model with Spring Suspension and Set Forward Axle
[Specifications]: ①Location: Front Left or Right, Driver or Passenger Side; ②Extended Length (in.): 19.672; ③Compressed Length (in.): 12.688; ④Travel Length (in.): 6.984; ⑤Upper Mount Code: L3; ⑥Lower Mount Code: L3