YSS ECO-LINE Black Edition Vespa PX, T5 Rear Shock AbsorberYSS ECO LINE Black Edition Vespa PX, T5 Rear Shock Absorber The G series front shock absorber made by YSS offer the rider a gas shock absorber at a reasonable price. The YSS Brand offers specifically built Vespa PX shock absorbers. l 340 mm body: silver spring: Black Gold spring pre load: continuously adjustable external fluid reservoir with ABE Comparison No. OK302 340T 01AL 388 (YSS)