2020 Tundra with JBL questions.

I traded in my 2016 Toyota Tundra limited for a 2020 TRD pro crewmax with the JBL stereo. I have all the stuff listed in the pics for my plug and play hook up. Is there anything else I need? Also, do I cut the speaker wire connections in the harness if I'm going to use an aftermarket amp with RCA cables? Thank you in advance.

 

Find the appropriate wiring adapters for your speakers..
No need to cut them.
Not sure which ones you need.

Amazon.com : toyota spaeker wire adapter

I didn't splice or cut anything in my audio upgrade.
I've got everything to put the stock stuff back in if I sell or trade.

 

I have the speaker harnesses just wondering about the head unit.