Motion cars were built to customer order so they could have had no spoiler, stock spoiler or a custom made Motion designed 3 post spoiler.
I have a NOS Motion 3 post spoiler and it is a very large unique spoiler.
looking at the pictures, I notice a few other things beside the stripe not being a normal Motion design for 1969
those Motion valve covers and emblems were not used in 1969 although some Motion owners added them later.
The steering wheel I normally see is the Grant wood wheel with holes not slots like that one, and I have not seen those traction bars on a Motion car or Motion catolog, the intake does not look like the one Motion used in 1969, I normally see the Edelbrock C427.
of course all that could have been changed over the years but it does not look like a 40 yr old barn find of an original Motion car.
I remember seeing Motion clones in the 1980s so there can be some old clones that may look like this