68 rr brakes

My 68 rr has manual adjust 4 wheel drum would like to make self adjusting any tips for hardware kits or do I have to piece meal it myself? On self adjusting cable what determines spring or no spring thanks for the help

You should be able to get a kit from any auto parts store or from a specialty place like Rock Auto.

try this link to napa.

http://www.napaonline.com/MasterPages/NOLMaster.aspx?PageId=430&CatId=3&SubCatId=7