The 1994 Constitution recognized customary law as being of equal status with common law.
s. 39 (2) When interpreting any legislation, and when developing the common law or customary law, every court, tribunal or forum must promote the spirit, purport and objects of the Bill of Rights.
(3) The Bill of Rights does not deny the existence of any other rights or freedoms that are recognised or conferred by common law, customary law or legislation, to the extent that they are consistent with the Bill.
See Chapter 12 on recognition and role of traditional leaders
UBuntu and the Law: African ideals and postapartheid jurisprudence by 
African customary law in South Africa by 
Traditional African Religions in South African Law by SOLO searches will probably reveal that other parts of the Bodleian - such as the Bodleian Social Science Library,
Bodleian Social and Cultural Anthropology Library, and the Bodleian Closed Stacks have useful texts on the topic topic too!
Chiefs in South Africa : law, power & culture in the post-apartheid era by