I can't speak to the GX470, but both front door actuators were toast when I bought my GX460.
I believe the OE brand is ASIN, which were ~$250 for a pair... at least ASIN is what I pulled out of my door.
I didn't want to spend that much, so I bought the
Gledewen brand replacement for part numbers 69040-42250 and 69030-42230 (again, for the GX460, NOT the GX470), about $70 for a pair.
They've only been in a couple weeks but seem to be working fine so far. I bought them on Amazon, so I figure I can always return if they break soon.
BTW, if you have more time on your hands, you could try rebuilding the door lock actuators. Just search for "gx470 flat shaft door lock actuator" and you should find threads like this:
GX470 door lock actuator motor repair - ClubLexus - Lexus Forum Discussion - https://www.clublexus.com/forums/gx-1st-gen-2004-2009/587449-gx470-door-lock-actuator-motor-repair.html
My plan is to just use the Gledewens that I currently have installed. If they fail prematurely, I still have my ASINs on hand, I will rebuild those before opening the door up to re-install.