| 50-299HD | RTE and RTE2 Series Suspensions - Vehicles with 33" from spring pin to center of cam on #2 hanger | 4 | 17 | 28 ½ | 0 | 11 | 1/660 10/625 | 6 15/16 | 50 - 55,000 | |
| 50-301HD | Tandem Two Spring Suspensions; RT and RT2 Series Suspensions - RT2 springs are 50-341, 50-345 and 50-347 | 4 | 17 | 20 3/8 | 2 13/16 | 12 | 3/625 9/587 | 7 3/16 | 52 - 58,000 | Turn down PL-1 L.E. |