1960 Valiant was the odd ball with the Bendix brakes. The 1960 Valiant has a list of parts that do not interchange with the later Valiants and Lancers. After 1961 the big change was the option of self-adjusting brakes in 1963. But you can use the self-adjusting parts on the 1961-62 Lancers and Valiants.
So, if you are having problems with getting parts for a 1961 Lancer, ask them to try a 1962 or 1963 Valiant.