I’ve got a new in box set of replacement copper battery cables from American Aviation brokerage and Leasing. They were purchased by my cousin a long time ago for his Cherokee and he sold the airplane and never used them. The STC was approved in 1987, no idea when the cables were purchased. They have been sitting sealed in the box ever since. They are brand new. Ground cable, battery to master relay, master relay to starter solenoid, starter solenoid to starter and engine ground to airframe ground cables included (5 total). New kits go for $400+, will sell for $200 shipped.