A small list explaining what vehicle has what injector. For identifying what injector style you have being that there no solid list of this info. Of ourse these are OE injectors.

98-02 F body uses a 60mm injector with the mini timer Bosch plug aka EV1
99-07 trucks use a 48mm mini Delphi plug.
99-07 flex fuel trucks use a Uscar plug aka EV6
07+ trucks all use a 48mm Uscar/EV6 plug
04 GTO uses a 60mm mini timer/EV1 plug
05-06 GTO use a 48mm Uscar/EV6
All Trailblazer SS use a 48mm Uscar/EV6
05+ Corvette all use Uscar/EV6, LS2 is 48mm, LS3, 7, 9 and LSA use 38mm injectors
LS1 CTS-V uses 60mm mini timer/EV1 plug same as f body
2010+ Camaro use 38mm Uscar/EV6
Pontiac G8 use 38mm Uscar/EV6

A pic of most common injectors


And the EV1/EV6 connector differences


Most of this info is borrowed and stuffed into this post.
Sticky maybe?