Dear Mr. Siebenmann!

Unfortunately, neither of DOS Cyrillic encodings contain these
symbols. You can easy check this fact yourself without any
DOS-based PC, using LaTeX2e Cyrillic bundle only. Execute the command

latex cyinpenc.dtx

You can find internal LaTeX names of these symbols in the description
of Microsoft cp1251 Cyrillic encoding as

guilsinglleft   139
guilsinglright  155
guillemotleft   171
guillemotright  187

But you will not find these names in the description of cp866* encodings.

In Ukraine, the encoding which is called cp866nav in the LaTeX
Cyrillic bundle, serves as the state standard of DOS-based Cyrillic
encoding.

With best regards,
                        Anatoliy A. Malyarenko