I bought a piece of 3/4" thick solid wood, and raised it to clear the plastic air vent. Then attached two 'L' shaped brackets on the sides to secure the plate to the two threaded bolts where the Bose woofer was attached. Then I bought a thin aluminum bar that I bent to the proper shape and drilled to attach the plate to the cross member in front of the seat (where the subwoofer used to be attached as well). Looks nice, but velcro would be a lot easier for sure.