Early car
late car
The early cars attached the center with sheet metal screws
The later cars attached the center with quarter turn Dzus fasteners
I think you might be able to mix and match early/late pieces as I think the curvatures are the same. With my limited exposure to both, it appears the attachment points differ between the two, so the early screw locations don’t wind up directly above the Dzus fitting’s “large” holes.
Larry