Went online to S&W chat and explained what happened. I was told that part number was the correct one. I told him it did not reach the lever, it's to short. He checked and said I have the newer model which takes a longer spring and he would put it in the mail that day. I asked for a part number and was told he didn't have one because it's not something they normally ship. I bet that changes!
Well it came today and while installing it it flew out, luckily I found it and was able to get it back together. I don't expect to be replacing it again because I am never removing the barrel stop lever again.
On another note I got a call yesterday from S&W about my original return when I explained everything, ( except they they were already sending me one). She said she would make sure she sends out the correct spring, so I should have a spare.
By the way this spring is green, the short one is silver if that helps anyone.