Cincinatti Millacron Acramatic Control

I've got a cincinatti millacron with a pallet changer on it and am trying to program a probing cycle for a renishaw probe. There are cycles for bores and holes but I need a probe cycle for a slot. Any ideas? I know G73 is a probing cycle for a bore/hole.
All help appreciated.

G79 looks like a pocket routine. X width M205, Y width M206, X centerline M31, Y centerline M32. Just pulling this out of a programming manual