I don't know D7 like I know D8, but there was an historical recording of D8 (recorded in real stereo, in 1953!) by Thor Johnson and the Cincinnati Symphony, that was originally in mono on the Remington LP label, but appeared many years later, in stereo, on the Varese Sarabande LP label. That recording helped me learn to appreciate D8, and sounds quite good, despite the dated sound. You probably will only be able to find this in a used record store, if you're able to play LPs.
Rafael Kubelik was recognized as an authoritative interpreter of Dvorak's symphonies, but Istvan Kertesz, also a recognized Dvorak interpreter, was the first to record a complete cycle of the symphonies on London/Decca, which BTW, is still available, and which is a part of my library.
Wade