Below: Before extensions.
http://i138.photobucket.com/albums/q...s/P1010652.jpg
Below: After extensions.
http://i138.photobucket.com/albums/q...s/P1010655.jpg
A total of 8 inches added with the extensions. It made a huge difference in the stability of my 3520, especially on side hills.
http://i138.photobucket.com/albums/q...p/P1010793.jpg
http://i138.photobucket.com/albums/q...p/P1010794.jpg
They are very well made and precision cut mounting holes and threads. They are NOT CHEAP! $$$.$$
If you have anymore questions feel free to ask.
Sincerely,
Dirt