Not having too much experience with VT commodores, I have only found out today that the rear garnish had extra light holders for parker lights (standard on calais I believe but never seen any working!)So I rigged up a set on the VT 50th from number plate globe holders (same size) and wired them in the loom (my loom plug for these lights did not have power to it).
Works a treat and looks great at night , wish I had found out years ago...and so simple to do 15 minute job.