Clunking under driver floor board

SOURCE: 2002 caravan clunking problem

may be boll joint
or sway bar link .

SOURCE: 2002 clunking problm

Check the macpherson struts to ensure they are not loose.  One way to check is visually in the engine compartment.  Check the top of the struts to ensure the nuts are not loose.  Another is to raise the side of the van where you hear the clunk.  Raise it so the wheel is off the ground.  Grasp and shake the strut to see if it is loose.  The struts should not be loose, but you never know.  As the strut is certainly ivnolved in bumps and rotates when the wheel turns, I would check there since you have already explored the bushings and links.

SOURCE: 1998 fORD ESCORT WITH A CLUNKING IN THE LF OVER BUMPS

Most definately some bushing. Just check all of them, make sure all the bolts are tight. Jack the car up and get underneath it and start wiggling the suspension. Grab the wheel and shake it. Try to find the corner or side of the vehicle that the sound comes from.

SOURCE: 1998 Ford Escort clunk under LF over bumps

Hi the most common fault on escort suspension is worn track control arm bushes followed by anti roll bar bushes i think you call them stabiliser bushes i would agree with your ford tech guy re the strut bushes let me know if it solves it

SOURCE: 2003 Dodge Durango clunking noise in front end can

With the information given this is not a sure solution. Questions that need to be asked is when does this happen, turning at slow speedm high speed, when hitting a pot hole etc? Since you have replaced a lot of things already, assuming you have NEW good quality parts so you did not replace bad parts with new bad parts i would definitelu check the pitman arm. This runs from the stering gear to the tierod. It can give you some good clunks while steering, especially at low speed when there is a lot of resistance. Check it by having someone turning the steering wheel when watchin/feeling it.