This particular series from Jada Toys has to be the THE HARDEST set to put together. There were originally 6 cars/trucks in both police and fire deco’s. 2 of the models were never produced as the line was quickly cut short. There is rumored to be only 800 complete sets of 8 vehicles that could be out together, as there were 800 units of the Chevy Impala, Chevy Astro Van, Chevy Suburban in both police and fire schemes that were distributed through Canada Toys R US exclusively. And 1300 units of the fire and police Cadillac Escalade’s exclusive to the Japan Toys R Us stores. So for US domestic collectors this was a feat to try and track down each piece. I know of approximately 40 sets known to exist with all 8 pieces.