I don't have any of the Nesties, but here's the dimensions of the stamps.
One is 2" x 2 1/2" at the points
One is 2 1/2" x 3" at the points
One is 1 3/4" x 2 3/4" " "
and the last one is 2 1/4" x 2 1/2"
If you're looking at the set, I started with the bottom left, then bottom right, top right and then top left.
Not sure if this will help or not.
Suz
http://www.suzastampin.com