Cart Parts › 800 Series Assembly Bolts Image 1 of 1 800 Series Assembly Bolts $5.00 Quantity: Add To Cart Added! (4) Cart top attachment bolts.These assembly bolts are compatible with all (plywood) 800 series carts.Sold in sets of 4. (4) Cart top attachment bolts.These assembly bolts are compatible with all (plywood) 800 series carts.Sold in sets of 4.