1987 400 SKS (0870559) - Suspension Sport Trail, 400 & 600. 1987 NOR 400 SKS (N870559) - Suspension Sport Trail, 400 & 600. 1987 NOR TRAIL SKS (N870561) - Suspension Sport Trail, 400 & 600. 1987 TRAIL SKS (0870561) - Suspension Sport Trail, 400 & 600.