My interpretation of the OSF and NSF is
Off-Side Front
and
Near-Side Front.
The Off-side is the side of the vehicle away
from the roadway kerb while the Near-side
is the side of the vehicle nearest to the
kerb.
Does that help?
Kodiak Transglobe 2.0 SWB
Bricks are the knowledge you are taught,
the cement is the experience you gain that holds them together.