Arrows were removed in ver 8. You could try
oUF_Real as a standalone Unit Frame replacement.
Can disable the default RealUI unit frames through: /realadv > HuD > Unit Frames > untick Enabled
Some things are anchored to the RealUI unit frames, so they'll need to be adjusted. Can't recall all off the top of my head, but:
/realadv > Frame Mover > look for Raven frames anchored to unit frames*
*To find the frame names of the new unit frames, type
/fstack and mouse over a unit frame.