Front Seat Head Restraint problems of the 2010 GMC Terrain

Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6) purchased 2010 GMC Terrain VIN [xxx] Feb 20, 2010. At test drive noted low head restraint location at full up extension= uncomfortable to back bone, and head. After purchase noted that gm supplied owners manual for this new model us car section 2-2 had description (warning notation & picture diagram of the proper adjustment), but due to the restraints design (too short of notched extension rods) the safe, and comfortable height adjustment cannot be achieved. Currently I have extended the drivers unit about 2 1/2 inches above its highest locking position (taped in place) which brings it close to the depiction in the manual = a comfortable driving position. I have taken the problem to the new american general motors up 3 layers of management (1. Dealership, 2. Customers support, and finally 3. Executive offices detroit only to be told in a phone call 5-26-10 that there is no fix for my concern, and that the operations owners manual my not reflect correctly the design of the head restraint placement. This comment was repeated by the service manager at the dealership in his statement to me that my actions were not safe, and that he was sure there was probably a disclaimer in the owners manual printing.