How big is that, 6" or 9" etc? Hopefully it's not a lot smaller than the OEM air cleaner. I know there isn't a ton of room where the corner one sets. I bought a large Amsoil universal filter thinking I'd find a way to fit it in the corner and build an enclosure somehow. When I got it in hand I thought whoops, it's too big. You want it large, but it has to have plenty of air volume around it feeding the filter. The front surface or fender inner part, is easy to open up, but the filter and what to build around it, that's the tough part.
You might hunt the Volant air cleaner(9400 or something like that part #), if one ever does pop up again. It fills the corner fairly well, but it's made for a medium sized cone filter.