Will these fit?

Ok, I loved my o/r H and Magnapacks for a while...but now they're a little too crackly for my taste. My buddy just got Flows with an O/R h on his cobra, and I love the sound. I'm thinking about buying some Flows, to replace the 'packs. I don't want to redo the hole catback, I want to just replace the mufflers. My question is will these fit?
http://store.summitracing.com/partdetail.asp?autofilter=1&part=FLO%2D952545&N=700+400238+308504+115&autoview=sku
From just looking at it, the only real difference is that they're wider than the round magnapacks, and they don't have a hanger on them. Has anyone done this? Will it work?

Well I was looking at the super 40s because I figured I'd need something that was centered on both the inlet and oulet, because of the way the magnapack catback pipes were. I looked around on summit, and I couldn't find any original 40s that weren't offset, and the super 40s did. Did you get yours to work on your SLP setup?