NEW PREMIUM  1 wire conversion kit for Delco 10SI & 12SI alternators. This kit includes the new parts as shown in the picture. A Complete brush set, with springs & a retaining pin, and a self-exciting 12-volt voltage regulator. Fits all Automotive 10SI & 12SI alternators. 10SI alternators were used roughly from 1973 to 1985 for many applications. 12SI alternators were used until about 1989.