Bulb Question

[Brickyard]

My cargo light is out (over my bed) on a 98 Z71. Now, I pulled the lense off yesterday and it appears that the bulbs are the same from the cargo/third brake light. Can someone shed some light (excuse the pun) on this for me?

Sylvania is listing a 912 for the brake light, and a 921 for the cargo.

 

[Wagonbacker9]

better late than never: the 921 is a brigher version of the same bulb as the 912. they are physically interchangable.