What years can I use to interchange parts on a 96 s10 2wd 4.3L extended cab??

 

96-97?? or depend on part??

 

Depends on the part. Sometimes you can use the same thing that will go on an 05. Sometimes you have to use the part specific to that year alone.
Generally, 95-97, but there were minor differences between the 95 and the 96.