I believe these are the female metripak connectors you need...
https://www.milspecwiring.com/FEMALE...AL_p_1559.html
I dont know where you could locate the seals or locking plates. Most aftermarket wiring system manufacturers wont detail actual part numbers of unit pieces.
Individual ign coil connectors are available for around $5.65 a coil end.
https://www.milspecwiring.com/GM-Coi...LS7_p_534.html