Check the listing for details. 2005-2014 Mustang Trunk Open Assist Spring Bumpers Mustang Trunk Spring (2 Pack). Color: Black, Condition: New. Listed at 6.00 USD. This listing is for a set of two trunk open assist spring bumpers for 2005-2014 Mustangs. These bumpers are made of TPU, a rubber like material that is built to last with high UV resistance and flexible qualities that remain constant in heat and cold. They're designed to be a direct replacement for the old rotted out pieces. They come in black with an shiny finish. These spring bumpers are great for those who want to enhance the functionality of their Mustang's trunk. A very simple one-minute install will bring a noticeable improvement to your trunk. Get rid of the old rotted-out pieces and upgrade to these. Fits all standard trunk springs from 2005 to 2014 Ford Mustang. Spring and mount not included, just the rubber bumper. Comes in a pack of 2.