looking for some add on stuff for my 05 Base Blazer 4wd
Seems that a lot of listings dont recognize the 05's
Is there a difference between them ?

 

There is no difference between the two years. Manufacturers often do not list it because the last few years were slated to be fleet vehicles only and for some reason don't show up the same way in their systems.

 

Most of the 05s I have seen were US Government vehicles of different agencies within the Government. They are the biggest Fleet account of all manufactures. But GM now stands for Government Motors after our President bought them in 08.