Found 4 alternatives for 61668-1 by TE Connectivity AMP Connectors. Card Edge Connectors Contacts — Tape & Reel (TR),Box.
TERM EDGE ECON SLDR POST GOLD
TERM EDGE DUOTYNE 18/22AWG CRIMP
TERM EDGE TWIN LF 18-22AWG CRIMP
TERM EDGE 20-24AWG CRIMP GOLD