Sprague 673D Electrolytic Capacitors
You can put multiple modern capacitors in parallel, as long as their combined ripple current rating exceeds the original specification. For example, you could use four 2500 &micro;F capacitors that have a 3 A ripple current rating to replace a single 10,000 &micro;F, 11 A capacitor.

Do NOT add any series resistors! The whole idea is to reduce the equivalent series resistance as much as possible, not raise it!