I don't think VPW has much anymore. Years ago they had sheet metal and many Sweptline parts but that seems to have dwindled.

Glass can be bought new. The windshield is available from many sources and the rest of the glass is flat and can be cut easily by a glass shop.

The gas tank can only be purchased used unless you find a NOS one somewhere. Many people have moved them out of the cab and retrofitted a tank from another vehicle under the bed.