daily drive looking for parts

Hi, I am now using my 1988 hijet every day, it has been super reliable and I have managed to put 900 miles on it in a month. I am off to wales this coming weekend to watch some rallying and am taking the hijet as a mini camper, I need to get a new air filter element as mine is a nice shade of grey but no one locally has one available, do people here have a preferred supplier for van parts? Thanks

On our hijet I soaked the paper filter off the rubber outer and then sandwiched a bit of dirt bike air filter foam instead so had a washable filter.