Here's one but won't use the cushion. Says it's a bolt-on for the DMI. Here's 3 places on-line that list it.
http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2012025/p-2012025/N-111+10201+600002329/c-10101/reviewflag-1#review
http://www.trailerhitches.com/hitch-accessories/bumper-hitches/2x2inchidreceiverhitchbox.cfm
http://www.realtruck.com/productline/385/1/1/curt_step_bumper_hitch_boxes.html