2357 tail lite bulbs or 1157?

Glad to help out.

Law requirement from 1/1/68 to 12/31/69 was side marker lights and/or reflectors. Effective 1/1/70 lights and reflectors were required. On A-body Mopars:

'68s have side marker lights (no reflectors).
'69s have side marker reflectors (no lights).
'70 and newer have side marker lights and reflectors.