Seven inches seems to vary a lot for grids and reflectors. Perhaps some of it is metric rounding to inches. I bought a set of 4 Impact 7" grids for 7" Profoto reflectors, and they were too small. I fixed them with self adhesive felt pads from a hardware store and they now work fine.
Similar story to Brian. I bought a Speedotron set of grids for a nice price, and they're quite a bit smaller than the Profoto 7" grid reflector. Better smaller than bigger, I guess.
got the buff grids today. They are a little small but they work great. Thanks for the recommendations. It was not only cheaper than the ones off ebay but came with 4 instead of 3 rings.