Sorry can't help with petrol/diesel but the tray comes complete with the frame, the tray is held in position with large headed pop rivets and the front rivets can't be removed unless you drop the frame (unless you butcher it). Some people have made up their own tray from aluminium and left a suitable hole for the sump drain plug, fixing the new tray to the original frame, if you choose this route just do a search on the forum where members have posted how they did it.