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the orifice is in line going to the evaporator(smaller line) above the accumulator(small dimples on the line where the filter stops). It can be split with 2 wrenches, make sure the filter goes in the same way it cam out and use some oil on the o ring(filter) and o ring on the line. Adding an ounce or 2 of oil with dye now is usually a good idea. Make sure you evacuate the system
let me know how it goes
the filter looks like this and it does go into the aluminum high side line.
I am very sorry, I went right to 3500 truck, not a cab over.
I will opt out and another expert will be with you.
Most Asian vehicles have a receiver dryer which is like the accumulator and orifice combined. Look by the front of the truck where the cab hinge is.
This is not the 6.0 but in front of the inter cooler is the dryer.