They are not online anywhere that I know of. Sometimes the Toyota web site shows them for the previous year (they currently have the 2023 4Runner brochure still on the web site.)

I just happen to have the '18 sales brochure because that is the year I have. I have a tendency to keep everything, a real pack rat of sorts.

Toyota has now gone to all digital brochures, no longer printing them to hand out. But when they were printed, you can find them from time to time on Ebay.

I did miss one:
-The Limited comes with X-REAS suspension.

Another Limited only option is full time 4WD, with Torsen limited slip center differential.