No Spark help

The male terminals usually hold in better, but if they do back out, or you've removed them, this is the barb that retains them.
upload_2019-6-18_20-35-47-png.png

The female terminals have a barb on the backs.
Your bulkhead connector may look different but the terminals work the same way.

If they look like this they are Chrysler style, Packard 58
img_7234-jpg.jpg
a15504-2t-jpg-jpg.jpg
If they look like the ones below, they are Packard 56 series.
Both install the same way. Sometimes they are interchangable. Sometimes not and they won't fit in or they will be too loose in the connector made for the other.
When installing the females make sure the locking tab is raised.
To remove the females, use a flattened cotter pin, tiny screw driver, or the tool they make for it to depress the tab while pushing it out.
factoryterminal01-gif-gif.gif

If there is a problem at the crimps, then a crimper for 'open barrel' terminals is needed to fold the wings in properly when replacing.
factoryterminal03-gif-gif.gif
(above 2 pics borrowed from civilianjeep bb: BASIC WIRING 101, Getting You Started! - JeepForum.com)