Hi Mate
I have an ARC Super Induction Air Box too, if your filters are in one piece you should just wash the by hand and let them dry. I've been washing mine and it works fine, just don't rub the hell out of them and rinse them really well.
You can get a filter washing kit made by K&N, it comes with 2 bottles of stuff one to wash and one to re-oil, just use the one to wash I don't think they need to be re-oiled I've never oiled mine.
These are the 2 sizes you need for the ARC box:
A - 236 x 200
C - 170 x 125
These are the measurements from ARC.
I think this K&N Land Rover Discovery V8 Filter will replace the larger one (A) 33-2119 but since I've been washing mine I've haven't tried this one. I spent a few hours going through the filter search on the K&N web site when I first got the ACR box.
The small © size filter on the front will be a problem I can't find one even close on the K&N site, you can get custom made filters from K&N but I think this would be expensive - I could be wrong as I've never asked for a price.
You will be able to get the K&N 33-2119 from Ebay cheaper than a store here in Australia.
If you try the 33-2119 can you post here if it fits the top of the ARC box?
Cool
Andy