In my experience the coupe has more similarity with the convertible in terms of overall shape and some items like the rear glass. However I have not had any experience with the dashboard between the models. Depending on availability and returns policy it may be worth a try. If you do manage to find a better fit please let us know.
I'm with boomer on this. My first thought when I read your dash question was that the coupe was a likely possibility and for the same reasons boomer mentioned. Unfortunately, the coupes aren't very plentiful either. There are none in any wrecking yards near me, though there was one last year that I should have studied before it was crushed. Good luck on your quest and keep us informed. - Mark