Here is a picture of the 1/2" pipe spacers that act as posts to raise the seat. I inserted nylon spacers (available at any hardware store) into the posts to keep the new, longer bolts dead center. I recommend using fender washers at the top and bottom of the posts to spread the load.

http://s844.photobucket.com/user/ma...%20spacers/IMG_1135_zpsv5nl5bby.jpg.html