Matt, a Cortez Silver survivor was recently listed on eBay. No photos of the undercarriage, seems the motor has been freshened, looks directionally correct with some missing components and typical rust areas (digg'in the period 8 track player). No Seller claims regarding documentation or born-with drive train components or correct / date coded accessories. Might be worth investigating (not affiliated):
eBay Listing Item Number: 140946924785
