Radio cleaning and pre-emptive cap. repair?

Newer caps are much smaller, you could likely place the old body over them to be stealth.

47 uF, 470 uF are standard values. Electrolyic caps have a high +/- 10 to 20% tolerance, those will work fine. I can see 3v, on one, ? on other side. Replacement should be same or higher. Typical replacement voltages might be 6.3V, 10, 25 ... I would look for automotive rated with temp rating of at least 105C or better, for long life.