My K10 is a bit of a cobble, and one of the things cobbled about it is the transmission cover and the boots for the transmission and transfer case levers. As you can see - even in this picture I took for some other reason - the PO installed aftermarket shifter boots for both levers.
Both boots were perished so when I took the cover off to replace the clutch a few months back, I tossed the boots.
After pouring over pages of build and picture threads, I haven't found a definitive answer on this topic. It seems that there is some sort of boot for the transfer case lever, but is there supposed to be something over the end of the shifter, or is there just a tight opening in the tunnel cover for the shifter?