looking for connectors

the round ones are the same on standard harnesses so shouldn't be hard to find.
For the flat inline on the small board... If you're willing to solder 3 wires to the board you can use a simple trailer hitch connector for service disconnect. This is better than having that connector / easily broken pin so close to the top of that board anyway.
If nothing other than OEM proper suits you, the Dart panels where a long sweep speedometer is will have 2 of the same inline connectors.