The Q-R Quarter Light or Window has the small window, which integrate the rear or on the front side of the frames. It can spilt the main windows. It presented in the old Fiat 1100s, Ambassadors, or this 1961 Ford Thunderbird. Originally, it has designed for the pivot open for the interior ventilation for the vent wings, wind wings or for the vent windows. It has the quarter windows that appear in the c-pillar area of the doors. They fixed at the position. The Quarter light has made for the unneeded by the vent window. It helpsin the flow of ventilation systems and the HVAC blowers. However, in some car it does not need as much. The glass also installed in the front window and secondly on the roof pillar. This display can help to increase the driver observing. This is non-movable glass and it is mounted on the front door. The corner section of the front door is the rear side, which cannot be sidled in the rear housing. The quarter glass can found on the A- pillar on the front side of the door opening. It offers the best ventilation systems also in the old vehicle. It can present on the B-pillar, C-pillar and in rare case ofthe D-pillars.