Nice find, it is a very rare and valuable car indeed. There were only 197 sunroof Challengers built in 1970, 114 regular Challengers, 82 R/Ts, and 1 T/A. These B and E body sunroofs were all the same and all were power. The Mopar sunroofs started appearing on the '69 Chargers and over the next two to three model years made it to almost all the Mopar muscle cars.

My dad has a '71 Plymouth GTX with a sunroof, the only year for the sunroof on GTXs, and of the 35 built it's the only one built for international export.

Your sunroof should look like this if it's a real factory sunroof car. There will be no indication on the fender tag it's a sunroof car as the fender tag was for the workers on the assembly line to follow and the sunroof was not installed on the assembly line. All of the sunroofs were installed by an outside vendor Chrysler contracted to do the work, after the cars were finished they were sent to the outside contractor to have the sunroof installed, before it was sent to the dealer. This resulted in delays of several months delays when ordering, thus few people ordered them. The M51 sunroof code only appears on the buildsheet, making the buildsheet the only way to authenticate a true sunroof car. If you have not done so look under the back seat for a buildsheet (other possible locations of the buildsheet are under the front seats, dash, carpet and headliner). If you have any questions, feel free to ask, I'll be happy to help.

If it's a real factory sunroof, it should look like this.


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