I have a set of seat covers listed on Ebay right now. I was given them for a very low price from a member of this forum. He only had 1 seat bottom and 2 seat backs. I could not get another seat bottom, so I ended up buying a whole set from Legendary. 1 Week after I got my new covers, my buddy found the other bottom. So now I have his seat covers for sale and we are splitting the money.
https://www.ebay.com/itm/1970-Challenger-Original-Vinyl-Seat-Covers-Black/233785492433
Most originals I have seen had markings like these on the inside material,.. original bucket seat covers from a 71 Cuda leather interior....but then I have not seen them all.
Yes, originals have printing on the inside. Also the "cord" you hog ring to is different on the repro covers. I've sat on enough original covers that looked perfect then split when you try to use them that originals do nothing for me.