Thrust reverser of B767 is part of airframe. It consist of two halves, each one accommodates three hydraulic actuators. On this picture we can see forward end of the actuators with respective tubing.
Czech Airlines celebrate 20 years of B737 service today, 03.07.2012 (first flight OK759/757 Prague-London-Prague). Total of 30 pieces went through company at this period, only last five remaining now (the oldest, delivered in 1992).