Light bulb part numbers for Capri's

Front turn bulbs - P21/5W
Upgrade for front turn bulbs - P3496

Brake, Rear turn signal and reverse bulbs - P21W
Upgrade for Brake, Rear turn signal and reverse bulbs - P3497

Instrument cluster and sidemarker bulbs - W5W

Dash gauge bulbs (the little tiny skinny ones) - W2.3W

Taillight bulb - R5W

A very good website for all things bulb related:
http://www.danielsternlighting.com

One good and easy safety upgrade that's very easy to do if your front sidemarkers are 2-wire devices (rather than getting their ground via metal-to-metal connection of the sidemarker housing to the fender) is described at:

http://www.danielsternlighting.com/tech/markerflash/markerflash.html