APR Performance Carbon Fiber GTC 500 74" Universal Adjustable Wing APR Performance Carbon Fiber GT 250 67" Adjustable Wing for AP1 & AP2 APR Performance Carbon Fiber GTC 500 74" Universal Adjustable Wing APR Performance Carbon Fiber GTC 300 67" Adjustable Wing for AP1 & AP2. Spanning 60. 5 inches and a height of 10 inches, the New GTC 200 adjustable wing for the Fiat 124 Spyder offers the perfect amount of downforce for midsize and compact cars. Each GTC Series airfoil is composed of lightweight and durable carbon fiber reinforced polymer (CFRP) composite materials. These airfoils contain pre pregnated woven carbon fiber sheets for superior strength and low weight. All CFRP airfoils are made using pre pregnated composite manufacturing processes (i. e. high temperature autoclave and vacuum bagging) in high quality aluminum billet molds. Supporting the airfoils are 10mm "aircraft grade" 6061 billet aluminum pedestals that come in a flat black powder coat finish.