I believe the extend Radflos' length were maximized for Greg's UCA's ... the rev from a year or two back. So any longer, if even possible with their design, would likely be too much spacer like lift. They might even be already flipped. Do you have a pic?
I don't think those are flippable. It looks like the hat holds the coil in place. On the ones below with a swiveling hat, they look like they are already flipped. The other way they'd be shorter and more of it would stick up through the top of the coil bucket.