Correct. I bought a new condition TRD Fox set for $1200 with less than 3K miles on them. a fellow forum member just told me that if I use 1inch cornfed (front passenger) and 1/3 inch cornfed spaces (rear passenger) side on top of the fox then the truck will be fully level on all sides... no KDSS lean and the TRD fox will work. this is when i though of buying a spare driver side Pro-Fox (haven't bought it yet) and installing it on the passenger side... just a theory to potentially avoid the spacers.

thanks i also checked the Fox2.5 from Fox and they are adjustable (depending o the model). would have followed that path if i didn't buy the ProFox set already.