Why bother? In NJ you're not going to see significant cold...
It was 4F this morning when I left for work. The block heater had been on all night so the windshield was mostly clear when I came out. The car started right up and I had heat by the time I got across town. If the sunroof liner was in (stupid sunroof) I'd have been super comfy. As it was I kept getting a cold breeze down my neck...
I stuffed a towel into the space between the headliner and the sunroof at lunch, hopefully that'll keep my neck warm on the way home.

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Sadly Benz-less