The M&H Wiring Harness is specifically designed for a 1970 Cutlass with an automatic transmission. This underdash wiring harness, with part number 15660, ensures proper connection and functionality of the vehicle's electrical components. With the reputable brand of M&H, you can trust in the quality and compatibility of this wiring harness for your classic car restoration or repair project. should have got a second opinion turns out i did not need this cost 700.00 new