The ViAir 400 or 380 (100% duty versions) was pretty much where I'd ended up - as the comps of choice to replace the weedy pidgeon OEM one.
I'll have to get their dimmensions and have a measure up. They're available for $235 from Airide.
The difficult part will be insulating them against excessive noise, given that new brackets will have to be made. You can buy a ViAir mounting bracket, but I reckon it'd be too big to fit inside the EAS box.

