cannot find /etc/default/grub to steer grub-mkconfig

[k2011gen]

I installed grub-1.98 from tarball and I can at least do a commanded boot or 
point to a usable 'configfile'. This is enough for me so I'm committing to 
grub2.

While trying to set some defaults for exercises with the automated menu writing 
via grub-mkconfig I find no trace on my system of any /etc/default/grub file 
where such defaults would be set (1.98 installed everything under /usr/local).

One thing I'd want to set in that default file or in /boot/grub/grub.cfg is 
GRUB_DISABLE_LINUX_UUID=true. I edited grub-mkconfig like so

  GRUB_SERIAL_COMMAND \
  GRUB_DISABLE_LINUX_UUID=true \
  GRUB_DISABLE_LINUX_RECOVERY \

but the file produced is still uuID based (which I can't use due to frequent dd 
mirroring).  Do I have to 'create' this default file, where can I find an 
example for syntax, and what would th e syntax be for a direct menu file edit? 


TIA