2wd balzer questions?????

[Eyegore]

OK I know the difference in years, well I think I know, I've owned 4 - k5' over the years. But I need to know if c-10 doors (truck), 82 to 87 with power windows and locks will fit a 76 - 78 2wd blazer? And what is a 2wd blazer classified as, c-10 blazer?
What year did they start using catalitic converters on 2wd, I believe the began using them on K-5's in 78.

Thank you for your help.

Tom