The Bilstein B6 24-186407 is a yellow, gas-pressure monotube front shock built as a bolt-in upgrade for the Spartan K-Series chassis and Mountain Master motorhomes. Bilstein positions the B6 as a performance step up from factory dampers, tuned firmer than stock while keeping original-equipment dimensions so it installs in the factory location without modification.
Choose this unit over a worn factory damper when you want firmer body control on a heavy, high-center-of-gravity chassis without changing ride height. The B6 is engineered around stock-height springs, so the factory spring rate and geometry stay in place while the damping improves. Bilstein also states the B6 can be fitted per axle, so you can replace just the front pair without touching the rear. Search terms this fits include Spartan K2 front shock upgrade, Mountain Master front monotube shock, Bilstein B6 stock-height replacement, and 1991-1995 Spartan K3 front damper.
Application listings differ on model years and chassis designations, with some listing 1991-1995 K2/K3 and others 1993-1995 Mountain Master, so confirm your chassis and model year before ordering. If your motorhome has been lifted or lowered, Bilstein points to its B8 line instead, since the B6 is sized for stock-height springs.
The manufacturer says the B6 is sized for stock-height springs. Its B8 line is shortened by about 20 mm to set correct preload with lowering springs, so the manufacturer recommends the B8 when the vehicle has been lowered.
Yes. The manufacturer states the B6 can be fitted per axle, including front-only or rear-only installs.
Owners on user forums report that the B6 arrived without new upper or lower mounts, and that the original rubber mounts were reused after inspection. Check your existing bushings and hardware before assembly, and confirm kit contents with the manufacturer.
The manufacturer states that shock installation requires special tools and expert knowledge, and recommends a qualified suspension specialist. A DIY front swap means raising the front end, supporting the frame on jack stands, removing the wheel, and freeing the lower mount before transferring the upper mount and bushings. Owners on user forums suggest holding the piston rod with a second wrench while loosening the top nut, and using a helper to reach the blind nut at the upper mount. The manufacturer also advises not wiping off the thin oil film on the piston rod and seal, and tightening every mounting fastener before the vehicle is driven. One owner on a user forum reported that a B6 on a different platform ran about 2 inches longer than stock when fully extended, so check spring extension and clearance before final assembly.
