To clarify: what do you mean by "legacy Model S housing"? Do you mean the rear view mirror mount housing that contains the windshield moisture sensor and the single forward looking AP camera? Still would be helpful to see post a photo.Never mind about my comment above. I found some images of the Model X dual housing and the legacy Model S housing. What I have appears to be the legacy housing.
These reports about some aspects of AP 2.0 hardware being installed on cars in production this month so far appear to be just rumors.