Rd28 air box

[The Hus]

Hi all, I just wanted to know if anyone would be able to help me out. Basically I have a rd28t with a safari snorkel and it has the the old safari air box, a previous owner must have played around with it and now the air box isn't sealed tight. I have been advised the replace the air box but the new safari snorkels tap off the stock air box, I'm unable to find a stock air box and wanted to know if any rd28 owners have an alternative solution. Cheers