Both Models A and C were produced at the same time, but the Model A could also be bought with a Model C engine, an option called Ford Model AC. The Model C engine is a flat-2 giving hp (kW) at first and hp (kW) by 1905. The Model C was sold for $850 (equivalent to $21000 today), with the option of making it a four-seater for an extra $100. The top cost extra, rubber for $30 and leather for $50. Although the Model C had a protruding front "box" like a modern car, unlike the flat-front Model A, this was purely ornamental — the engine remained under the seat.