I am in the middle of this upgrade on my '17 TRD Sport Access Cab. I got the tweeters from Amazon they were $95, but using my Amazon Card, i get 5% off, so I could live with spending a couple extra dollars. I got the others from crutchfield Kicker 43CSC6934 6x9 3 ways for the front doors ($74.99), and the Kicker 43CSC674 6 3/4" 2 ways for the back door.($51.99) Crutchfield supplied the adapter rings, Toyota wiring harnesses, hardware and instructions. All delivered the next day. I was very happy with the service.
So the tweeters arrived on Sunday, and I put them in. Right away, there was a huge difference in clarity, night and day. I wasn't going to order woofers right away, but after seeing the improvement that the tweeters made, I had to pull the trigger. I installed the 6x9's in the front door this evening after work, but haven't had time to install the rears yet - that'll happen tomorrow. Even with the tweeters and front door speakers, the sound quality is tremendous. The difference in magnet size and cone quality is tremendous.
I'm happy with the stereo now, and I'm sure I'll be even happier tomorrow when i put the rear drivers in.
--Chris