I am looking for an original (NOS, used, dead or alive) Delco X Energizer C89 Maintenance-Free battery.
This was the optional, maintenance-free battery that was offered in Pontiacs from 1971 to 1975. In 1976 they were replaced by the red, white, and blue Delco Freedom Battery.
No one reproduces this battery as it is just too obscure. Here's a couple photos combined from a 1971 and a 1975 brochure:
