G'day Aiden,
I'm no expert on this, because my SR came with an FMF fatty pipe already fitted to it, but there are plenty of SRs getting around with aftermarket pipes. I don't know how the attachment is done exactly, but it can't be too hard. It might just involve welding a couple of hooks onto the flange or something so that the springs have somewhere to go. It's sure to be a lot less welding and mucking around than gutting the stock pipe.
If I were in your position, I'd probably just take a chance and order the pipe knowing that I could nut out an attachment solution visually. Let me know if you want me to try to describe how mine looks or whatever.