I installed those new AVM hubs yesterday.
These are my observation as it applies to the 1991 Prado I have (with G144 axles).
They do "bolt on and go".
My vehicle used 4 studs and 2 pins (the pins are RIGHT next to 2 of the studs) for the electric locking hub housing to mount up.
The manual hubs have 6 hole locations and 2 recess locations for the pins.
In addition to the 4 studs and 2 pins, it also has 6 off-set threaded bolt holes BETWEEN the 4 studs and 2 pins (a total of 12 holes each side), I made an attempt to check and see if the 6 empty bolt holes lined up with the new gaskets (and subsequent manual hubs).
They did seemed to line up, it's difficult to be certain as I left the studs for the electric hubs in place.
That being said, I think if you pulled the studs and two pins you should be able to make use of the 6 off-set holes with the new bolts (6 each side and the new cone washers) in the box and have little or no problems doing that. (Again, it looks like those off-set holes line up).
On my vehicle, using the 4 bolt set-up (remember the manual hubs have 6 holes) there are two bolt holes that don't have threaded hole under those locations, Toyota simply didn't put holes there.
(The electric hubs didn't have the two additional holes, just the 4 bolt pattern and 2 pins).
I opted to simply use the studs and pins the electric hubs used and leave to 2 additional bolt holes on the manual hubs empty.
I reasoned if it was good enough for the electric hubs why not the manual hubs.
Let me reiterate that this vehicle is used to deliver mail, the most demanding situation it will face is some snow, possibly a foot at the most at any given time.
If I was headed to the back country, I would recommend finding AISIN hubs and using them, providing the spline count and bolt lay-out was correct. (As mentioned earlier in this thread (GTSSport) you can swap spindles and use the factory AISIN hubs as well).
I tested the rig on a snow covered driveway with a 20%+ grade and regular street tires, the truck went up without a problem.
In summation, these AVM hubs worked out just fine given there mild application.
They are made of a light weight aluminum castings and some plastic parts, (for whatever that's worth).
Thanks again for all your help and comments folks.
Until next time, Allen