There are a total of 7 lamps - 3 small ones that backlight the bottom right buttons and 4 larger ones; 3 that backlight the LCD display and 1 that lights the power/push/volume/tune/select graphics. I will replace the 4 larger lamps as the other 3 light up buttons aren't used much and it's not worth the time, honestly. If you REALLY want them done let's talk.
Want this?:

Price: $40 - you ship to me at your cost and I ship back to you using standard USPS shipping at my cost reusing your box. US 48 state only. Outside of that, we can talk. Corvette radios will ship you only 3 of the 4 bulbs for $23 so I think this is a fair deal as you'll have an electrical engineer doing the repair for you!!