1971 Roadrunner 340 N95 Emissions

Does anyone know what Plymouth did for emissions on a 71 Roadrunner 340 4 speed with the N95 on the fender tag?

They had a NOX device mounted on the firewall and a unique engine wire harness to accommodate it and the associated small parts which were transmission specific

Thanks Scott-
Any chance there is a pic of the firewall device out there?

I found one of your previous posts. This should help when I get home.
https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/7505574/site_id/1