Thanks for the replies, guys.
I actually did mine about 3yrs ago using the radio shack bulbs and they haven't failed yet, including two winters in NY state, so I would definitely recommend the radio shack bulbs if anyone has experienced that the OEM ones keep burning.
I needed the procedure for a colleague who just got his first legacy and found (of course) that his hvac control didn't light-up.
Take care,
Thorsten