Still in business but may be totally different operation than previous...contact name looks positive!.
Dealer Code (@1986 shown below) may have changed or be different than years you're seeking info on?.
Good luck!

~ Pete
Zone 29 Dealer 534
Maples Chevrolet/Oldsmobile
300 E 17th St S, Newton, Iowa, 50208
Contact: James Maples
Phone: 515/792-3289