NYBOB, I hope you have better luck than I did with trying to get weights for my 3520. I'd have to look to see what I ended up with total per side. It takes one starter weight and then you can stack as many additional weights as you desire. After two though you will be getting out past the edges of the tires. I went with the starter and two additional weights per side and then another custom weight to give a finished look. I've been told by some that these are not the correct weights for my wheels. Who knows???
If you have any questions feel free to ask. I'll help as best I can. Oh, one more thing....... no one seemed to know how the weights mated up to each other or what bolts I needed either. I finally figured it out, it was like a puzzle.
Sincerely, Dirt