Other than the terminal ends, you don't need anything "Minn Kota Specific". And even the terminal ends can be found easily. I got ALL of my wire, terminal fittings, etc. from
https://tinnedmarinewire.com/wire/ when I wired my boat. Zero issues with anything in the 6 years since I wired everything up. As long as you get the proper AWG size and ensure that the wire is tinned, it will be fine for any marine application.
Here is 8 AWG tinned wire for .79 cents a foot.
https://tinnedmarinewire.com/wire/i..._id=12&zenid=608b17a8cf6f7e4f7123a84c9dd700c7
You should be able to find the terminal fittings you need here as well.
https://tinnedmarinewire.com/wire/index.php?main_page=index&cPath=9
I recently bought a used 24V 74# Minn Kota Maxxum. Got it installed on the boat, wired up and it wouldn't run. Figured the control board in the foot pedal was bad. Tested it and found a lot of the connections were corroded. Cut out the corrosion, replaced the female QD's with ones I got from my local electrical supply company for a few bucks and all was good. Had it out for the first time and the head would get so hot it would start smoking. Got it home, opened the head and found the power wires in the head were also corroded (luckily they didn't catch fire!!). I cut out the section of wires that were corroded, replaced them with the proper size (10AWG) tinned wire and connected them with tinned heat shrink butt connectors. Runs like a champ now. Point is, for wiring you don't need anything manufacturer specific, in a sense. As long as you use the proper size and type of wire and the proper terminal ends/connections all will be good.