I have some pantographs that came with my second hand Pfaff 1200/Inspira frame set up which is basically the same as your. Just measured them and most of them seem to be in the 3" range, some a little larger and some smaller. They are from Golden Threads but I am sure you can get them elsewhere. There are a couple of videos at the site that you might want to watch also. Good luck and have fun!
http://www.goldenthreads.com/shop/category/pantographs/
PS: I have the single pages that are shown part way through the first video where you have to photocopy them and tape together to fit the full width of your quilt. I have also used the Golden Threads quilting paper to mark a non-edge to edge pattern. It tears of easily.