Just received an email back about the TWM airbox and unfortunately they are no longer offering them and won't be in the foreseeable future so it looks like the MJP one is the go depending on size and freight costs unless I can find another brand somewhere.
That looks good, wonder what the size is like, if its a bit lower profile it might fit a bit easier. Will send them an email asking for dimensions and see what they say. Might work out a little cheaper too depending on freight.
According to: http://www.racetep.com/ztripdcoe.html they are $395, that is in US dollars and without freight, haven't heard back from them with a quote with freight yet.
Cheers for the replies, sounds good, I'll pull out a tape measure and see how much room I've got over the next few days. Was thinking about making one up out of aluminium but for the price of this one it doesn't really seem worth the effort if this one will fit.