There is one http://www.avialogs.com/en/aircraft/ussr/mikoyangurevitch/mig-21/mig-21bis-pilot-s-flight-operating-instructions.html#download
I have this same manual as PDF (115Mb), uploaded to OneDrive http://1drv.ms/1uifJY7.
almost perfect, atmospheric pressure window in barometric altimeter is now missing. Need to copy more files I think..
edit: Fixed, copied MiG-21_Pressure_Gauge.dds and now it's working.