Walky Barrier Folding Universal Auto Pet Safety Barrier K9 Guard Pet Safety Barrier Fence MUST HAVE ROUND ADJUSTABLE HEADREST STEMS FOR MOUNTING.This is a headrest mounted car pet barrier & requires adjustable headrest stems 29 Inches apart maximum width. Attaches to the adjustable vehicle headrest stems. Folds down when not in use.Fits almost all cars, hatchbacks & mid size SUV's with adjustable headrests. Simple & Effective. Adjustable horizontal bars - The cleverly designed telescopic bars ensure a perfect fit every time. Horizontal bars lock & loosen by twisting the bar. No more loose hardware to lose. Adjustable Vertical bars - Height is easily adjusted and the top vertical bar can be easily removed for even lower roof heights. Safely keeps your pet in the cargo area,or backseat, away from driver and passengers. Adjustability : Width adjustable from 32.5" to 55.5" {82 cm to 141 cm}. Height adjustable from : 11" to 14.25" {28 cm to 36 cm}.* ALWAYS measure your car prior to ordering.