The Pe-8 was an exceptionally rare sight on the Eastern Front, less than 100 built total. Almost universally used at night. For a heavier level bomber, you basically only have the IL-4 that really fits the timeline of this sim, and that is still lighter than the He 111. Heavy bombers was just not a hallmark of the Eastern Front. There is also the TB-3 of course, but that is really just asking for Luftwaffe target practice.
I didn't find the right solution from the Internet.