Replace/refresh 7 segment display of vintage 80's clock radio
You can buy individual common-cathode displays and use discrete LEDs for the four additional LED colon and anunciator positions. There will be a bit of wiring to do, which could be done with a bit of perf board and some solder-through magnet wire of ~AWG30. Should not take very long. 

You'll have to evaluate if there is enough room, you'll need something like 11 or 12 mm thickness, which is probably more than the original display. 

For example, Rohm LA-601EL. Use indicator LEDs with similar nm wavelength to the LED displays to reasonably match the colors. You might need to fiddle with the discrete leds by adding tubes, flattening the ends or doing something like that to get a good appearance, but fortunately they're cheap so experimentation is no problem. 

A modern LED display such as the Rohm will be much brighter than the old displays at the same current, possible way too bright. Since you have a way to dim it, that should not be a problem.