Fuse box and manual show rt spot and lt spot on 06 monte lt, wondering what these are for
I don't have any fuses in there, guessing for for the ltz or ss ?

 

Judging by "RT Spot" etc., I'm assuming they're for "right" and "left" (RT and LT) spot lights/fog lights that are come standard in the front bumpers on the LTZ and SS models. If you search Google images for "2006 monte carlo ss" or ltz, you will see that those models indeed have the factory fog lights. Your LT model does not come standard with the factory fog lights. But that fuse slot(s) is available if at one time you decide you want to install your own fog lights into the front bumper!