Parts & Accessories Spare parts 3 GMC differentials, external axle without crown. Suitable for those who want to install it on a tow trailer. Complete with springs and rims. Price for one is 1000 SAR. GMC Chevrolet, pickup, armored Bahbehani, Sierra, Suburban, Superman, GMC, Blazer, Silverado, pickup, models 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87.