Grumble Grumble Grumble
I can't find a reference to 'Endless Road SSX', but there is a 'Arcadia of My Youth: Endless Orbit SSX (TV)' anime series, which remains unlicensed for US Region 1 (grumble grumble grumble).
The other Harlock series I've been searching for is the original 'Galaxy Express 999' TV series, which is the second series that Harlock makes an appearance in. This series from the 'Golden Age' of anime is also unlicensed for 'Region 1'. The original series that Harlock makes an appearence in is either the second or third TV season of 'Space Battleship Yamato'. My collector friend tells me that in the English Dub (Star Blazers) Harlock is shown in the episode previews, but the scenes where he appears have been cut out of the english Dub (drat! curse!)
My friend and myself coordinate our Anime collections (to avoid duplicates) and between us, we have 'Captain Harlock: The Endless odyssey' (The best of the lot), 'Gun Frontier' (Harlock in the old west, Weak series...), 'Maetel Legend (OAV)', 'Harlock Saga (OAV)' (Harlock vs. the Norse Gods...), and 'Queen Esmerelda'