Rectifier tube question

Hey guys, i just got my new(to me) stg. 2 trident in the mail and the black stem on one of the rectifier tubes got broken in delivery so I currently have only 2 of 3 rectifier tubes for the amp. I know that it is bad to run the amp without all of these tubes in, but what i was wondering is can i mix and match rectifier tubes? the other two are the mesa 5U4GB tubes but i didn't know if i could run to a guitar store and just get any rectifier tube?

Thanks!

50 watt mode on my Roadster only uses 1 rectifier tube. Probably the same for yours too. I bought a rectifier tube from Guitar Center and it didn't work. I recommend one of the online vendors such as Tube Store, Tube Depot, or Doug's.