another f/m/j spindle question

hello,

This topic has probably been beaten to death here, but i cant seem to find a solid answer. I think there is some disagreement that I would like to sort out before I go shell out $140 tomorrow.

Some people say the f/m/j body spindles work fine. Others say only the B body spindles are taller.

Mopar Action seems to think that they are all taller and will change the steering geometry.
http://www.moparaction.com/tech/archive/disc-main.html

Are the F/M/J spindles taller? If so, is it by enough to make a significant difference?

Thanks,
Cameron