Finding 84 GN interior parts will be very difficult to find even harder in good condition.
I know from years owning one.
Most items are discontinued sometimes seats show up but in poor condition.
Sand fabric is out of stock
Checkout Gbody Parts they may have sand paint and some parts
Good luck...
Dave did mine couple years ago. I took the tranny down to him (I live in Connecticut).
He took it apart While I was there and expend what he was going to do to fix it.
Turned my 84 BQ into a BR also Had it ready in less than a week.
After I got in back in the car, he spent the time on the phone...