For anyone who is interested in finding the old school incandescent nearly impossible to find 7444LL brake light bulb, the GM Parts number is 13591403. This can be found at most GM dealerships and various online vendors. I started a quest to find a 7444LL bulb at the local auto parts stores; NAPA, O'Reilly's, Auto Zone, locally owned stores, etc. to no avail. They all sold only the the 7443LL which is a less bright than the 7444LL.