66/67 Driver’s Seat Side Panels

I pulled a set of 66 Dart buckets at least 30 years ago and a set of 67 Charger buckets about 10 -12 years ago. The driver’s seat base only had the left side panel; the passenger seat base had both sides, is this correct or a coincidence both driver’s side were missing the right side panel. This is the panel I’m referring to:

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