I've got a few, do you know what type you need as I think tbere are a couple of different types. The freehub is different so if you have a pic of yours I can match with one of mine and work out what you need.
I'll take a look later and see what I have. I know I have a 7 speed version the same as that, though I can't remove it from my wheel as I only have one chain whip. I might have another though.
Checked the stash and the only 7 speed ones I have with the single lock ring look a little different. The ones that look similar to yours have the double lock ring/cog arrangement. Not sure if they will suit but can post up some pics if you like.