Thank You.
Very helpful!
Just found on another board that the bolts should be 6mm.
I can recall when I first got the car, that I grinded down a socket to fit in the plastic housing but can't for the life of me find it.
Now I just have to work out which way round the filter goes as I removed mine about 2 years ago and cut of the cover and just replaced that.
I came to the conclusion my model didnt have a pollen filter after searching high and low. I will have another look now!