Me too.
I've looked at several palaces. Weather Tech doesn't list them for 1973 to 1987 GM truck either that I found.
I saw a cool "Chevrolet" one (I have a GMC) at Wally World, but it too was too large.
Got back on this and finished the project.
Decided it looked better with the edges rounded off.
Not an award winning effort by any means, but a place to set my Mountain Dew/Dr Pepper and my phone while driving.
Had some interior door panel blue that matched.
Works for me !