Silvertone transistor cross reference?

[Axtman]

I cannot seem to find a cross reference for Sears Silvertone transistor part numbers (for example 41-6068). Does anyone know where I could find this information? Thanks.

[The Dude]

Are there different numbers on the transistors themselves? Sometimes, Sears had there own house numbers, but transistors in the amp had relatively standard part numbers.