The MAF is braced vertically from the bottom with a thin piece of metal bar that I snagged from a friend. You can probably pick something up at Lowes Depot if you do not have anything laying around. I just cut it, drilled holes in it, and used existing nuts to hold it on.
Because of my damper adjustment knob, I could not use the bigger filter that I wanted, so I went with a slightly smaller filter. Still, I had to carefully bend the metal brake lines a little to wedge it in there. You would have to bend them, too, I imagine.