Running LED off 9.3 Volts AC

I need to replace an incandescent dial lamp in a modern radio, and I
would love to replace it with a high brightness LED, to save having to
replace it in the near future. Problem is, the source voltage is 9.3
volts AC, not suitable for running an LED off directly. What value
resistor would I need for this?

The specifications of the LED I had in mind are as follows:

# Emitted Colour: Sunset Red
# Forward Voltage = 2.0V Typical @ IF = 20mA
# Reverse Voltage = 5V
# Maximum Voltage = 2.6V @ IF = 20mA
# Luminous Intensity = 6,000mcd Minimum, 8,000mcd Typical
# Peak Emission Wavelength = 640nm
# Power Dissipation = 80mW
# Continuous Forward Current = 50mA
.