A Wild Hare - albeit unremastered - can be found on Volume Three as part of the What's Up, Doc?: A Salute to Bugs Bunny television special.
Restored versions of both shorts can be found on the Platinum Collections (A Wild Hare is on Volume Two, Rhapsody in Rivets is on Volume Three) and the Warner Bros. Home Entertainment Academy Awards Animation Collection - I have no idea why they were left off the main programs of the Golden Collections.