I need the GM part numberfor what the 1978 GM Light Duty Truck Shop Manual calls a "Dash Accessory Panel" or the plastic dash cover that fits over the metal dash frame for a G Series Van. And if possible what years of the G series vans used the same dash. The 79's had the ignition in the steering column so it has to be 78 and ealier. Any help would be appreciated. Thanks

Greg in Michigan