For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:common/openSUSE_Leap_42.3/spins:invis:common.repo
zypper refresh
zypper install grub2-i386-pc
For openSUSE Leap 42.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:common/openSUSE_Leap_42.2/spins:invis:common.repo
zypper refresh
zypper install grub2-i386-pc
For openSUSE 42.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:common/openSUSE_42.1/spins:invis:common.repo
zypper refresh
zypper install grub2-i386-pc
For openSUSE 13.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:common/openSUSE_13.1/spins:invis:common.repo
zypper refresh
zypper install grub2-i386-pc