Home Fourth Gen Mustang 2004 Ford Mustang 2004 Ford Mustang Production & Sales Numbers Normally the final year of a Mustang generation sees a spike in sales volume. The end of the fourth generation in 2004 did not follow that pattern. Sales of 141,907 units was down 7.5% versus the prior year. Total Production Numbers Year VIN Body Style Units Produced % of Total 2004 P40 2 Door - Hardtop V6 64,484 45.31 2004 P42 2 Door - Hardtop GT 22,724 15.97 2004 P42 2 Door - Hardtop Mach 1 7,182 5.05 2004 P44 2 Door - Convertible V6 28,330 19.91 2004 P45 2 Door - Convertible GT 13,928 9.79 2004 P48 2 Door - Hardtop Cobra 3,768 2.65 2004 P49 2 Door - Convertible Cobra 1,896 1.33 2004 Total 142,312 100.00