Electronics: Looking for some connector plugs for electronic clusters

I am trying to find some of the connector plugs used on the electronic clusters for the 1984-88 K and E bodies along with the 1984-87 G bodies, they are one black 21 pin and one blue 13 pin. I also would like to find a pair for the later 1988-89 G body and 1987-89 J body, these use a black 13 pin and a natural 13 pin connector. I have a batch of both styles I am trying to test and repair.

The other thing, if anyone has any service information on these, schematics or any internal breakdown I would really like to have any information on these.