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The Green brgs are ok , they will eliminate the adjuster completely though & may require the center spacer to be removed , , they are a roller ball type brg & will locate the axle side to side so the adjuster is not needed , but they do not take side loading / cornering load as well as the factory tapered roller brg & therefore will not last as long
The center section / carrier will slide out after pulling the axles out 6" or so , you can get a gasket form the aftermarket but the dealer will just sell you a tube of silicone , personally I clean the suface with brake clean & use a good qual;ity silicone like permatex ultra Black & no gasket
The Cuda uses a generic 7" round headlight pot so a Dodge Van or Volare should fit fine