There are only two people selling correct truck spatter paint for first gen cars now. Brian Henderson at Supercar Workshop and Larry Christensen from Camaros plus. We stock Larry's but I'm not sure if Brian is marketing his or just making it for his customer's cars.
I am also working with Dave Cunningham from BASF. I gave him three original trunk pieces to match in his chem lab. All of the other stuff available today is not correct and wont' fly in concours restored judging.