This is a "After Market Front Timing Cover With built in high volume Oil Pump" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. The cover is a direct replacement. It comes with all the hardware shown in the pictures. Gaskets, larger gear set, springs, and front seal are included. This cover replaces your factory cover and features a larger gear set. This cover features a larger than factory gear set, this allows higher oil pressure. A separator plate is not necessary with this unit. Also, the front seal is on the out side and easily accessible unlike the factory cover which is on the inside.