Well first off there is a MAJOR difference in a Yo Eddy frame and a Wicked Lite. I do know that the 97 Yo Eddy took a 1 1/8" h.s. The 10th Aniversary Yo was a ti. frame and utilized a 1" h.s. The early "Fat's' more than likely had 1" h.s. the latter 1 1/8" and it is still that way today, with one or two frames being the smaller, especially if you go custom.
Here is a good link.
http://www.firstflightbikes.com/fat.htm
Also the Yo Eddy used a 29.4 seatpost and the Wicked used a 26.4. I hope this helps.