The shocks mount exactly the same, no issue there. The ARC shocks have air lines which you can easily tie off or remove, they lead to a solenoid nearby. There is a display/error on the console trip computer screen, if the system is intact and not working right.
Do you have that on the display, someone may have already removed(disconnected) the ARC module to the right of the radio? If your truck still has the air compressor above the spare tire, and height sensor in back, I could use those for spares.
Here's under the back of my 99, showing the ARC compressor, shocks and height sensor;
View attachment 158949