1964 C10 project with questions

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New guy here as I recently acquired a '64 LWB custom cab and starting to address a host of little issues. My first round of parts just arrived from Classic Parts including a complete turn switch switch assembly and lever.

The existing switch was a mess and I am trying to determine what type/size screw was used to secure the lever to the switch. I tried searching and came up blank. Any input appreciated.

I also ordered a new front alternator harness that includes the headlights to firewall plug and could use some input on how the headlight connector at the firewall unplugs. I tried several times pulling on it to no avail. I assume it just should pull out and the front harness stays attached to the firewall, correct? Are they any connector catches??

Thanks in advance!