Re: Stock Air Filters
No problem. I looked forever and finally found mine on eBay and got them for 5 bucks. They come up every so often, and sometimes are missing parts (such as the internal spacers - you can fabricate these). Don't worry about bolts and washers since they are available from the normal parts folks.
I'm not sure if your year used the emisssions take off from the air filter, and if so, you may have to put up with plain ones, since I've never seen these, except in books.
I had to refinish mine since they were in pretty bad shape cosmetically. Now I'm ready to install and apply the new decals but don't know which end is up since there were no decals on them when I got them.
I'm just going to assume that the British engineers were logical folks and that the holes are in fact to drain water and so should go under.
Hope this helps - and good luck.