Long story short.... bro in laws truck (2004 f350 6.0) had an KN open air filter system installed when he bought the truck and he over oiled the filter which coated the Mass Air Flow sensor. The filter is very old and damaged and needs to be replaced. He wants to go back to stock air filter so he does not make that mistake again but cant find one anywhere. I called three auto salvage places for him to which they all said "no diesel parts". I contacted ford and they want $397 for new air box and filter. Nothing on ebay or craigslist. So I thought maybe someone here might have their old OEM air box tucked away somewhere that they may want to sell or might have some other idea. Money for him is limited but I was also thinking of maybe some other dry or non oiled air filter that may work for his current set up. Thanks!!!