I have a 2012 and 2006 B-400. Can anyone tell me what model year Isuzu headrest has the proper bar spacing to accommodate the stock seat? On ebay all I see are the headrest that will fit a 650, about 7 inch spacing but none for the 400's. I did what I feel was a through search on the site but could not find the information. If it has been already posted I apologize.