james tbh mate I don't know what an alternative could be pete owns the tooling rights to that filter
I did try to get one direct from k and n and they told me I can only get them through pete.it must have cost me more in texts and phone calls chasing this up than it did for the whole catch tank
he told me on two occasions that these where special order from America when it turned up it had a sticker on it saying made in England lol.
I hate being lied to.