The original ones have pins that go into holes in the fender but they do have ones that stick on that look the same as the original ones and they are original Mopar parts, it is the same story with the Challenger emblems originals have pins but you can get stick on ones.
Welcome to the site from the Motor City! Joined January of '13 and made your first post, it's about time! ( I don't know why I notice these things) Lets see some pics.
I had some very old R/T emblems on the fenders of my A66 project I sold recently that were stick-on. The paint was emaculate under them so I knew they'd been on for a lot of years and they had part #'s on them in keeping with the 1970 model year. The A66 was not an R/T though...