In 1969 Porsche stretched the wheelbase of the 911 and 912 2.3 inches and added fender flares to the front and rear wheel arches. They also added substance to the interiors of the “long wheelbase” cars by trimming the dash differently and adding solid door pockets, shoulder belts, and headrests in the seats. The reason Porsche stretched the wheelbase was to tame the ill-handling 911. The heavy rear weight balance made the “short wheelbase” cars a handful to drive near the limit and they often caught even the most experienced drivers in arrears. Spinning backwards off the road was a common thing in these early cars. The lengthened wheelbase effectively moved the bias towards the front wheels and the “long wheelbase” cars were mostly tamed.