Bilstein 4600 Series 89 91 Mitsubishi Montero Rear Monotube Shock Absorber All The Bar's on Broadway in Nashville The Complete Guide. Bilstein B6 4600 shock absorbers are designed as a direct fit upgrade to OE shock absorbers on stock height light trucks and SUVs. These shock absorbers feature a monotube design which provides consistent fade free performance. B6 4600 shock absorbers utilize a unique, velocity sensitive, digressive piston which reacts to changing road conditions. All B6 4600 shock absorbers are tuned for each specific application to ensure optimal performance is achieved. B6 4600 shock absorbers offer a significant improvement in ride quality, handling, and comfort. This Part Fits: Year Make Model Submodel 1989 1991 Mitsubishi Montero Base 1989 1991 Mitsubishi Montero LS 1990 1991 Mitsubishi Montero RS 1989 1990 Mitsubishi Montero SP 1989 Mitsubishi Montero Sport