Plenty of adapters are sold (both by Apple and by 3rd parties) for connecting DVI monitors to ADC ports, ADC monitors to VGA ports, etc.
All it would take is knowing what kind of connector port(s) your card has, and what kind of connectors your monitor(s) has/have. Then, your solution is but a single Google search away.
If you need help with the Google search, then tell us exactly what kind of connectors your monitors have, and what kind of ports your video card has. icemanjc provided links that will help you identify exactly what kind of connectors you have.