Anybody ever see a N97 Noise Reduction Package on a slant six Duster?

I have a '75 slant-six Swinger with the deluxe insulation package. So far I've seen insulation underneath the forward portion of the trunk mat, insulation between the trunk and rear seat, under the dash, under the rear seat bottom, tar boards on the floor pans, a hood pad and a resonator. Has nothing to do with California. My car was sold new in Huntsville, Al.