Did they ever make 1963 Pontiac Grand Prix?

I began modifying an old annual AMT 1963 Pontiac Bonneville HT kit into a '63 Grand Prix, then it occurred to me that someone might have done this, either one of the 'bigs' or a resin source.  Hacking off the original 'convert top' hardtop and grafting on an AMT (?) accessory concave-rear-window roof was easy. now I'm worried about how accurate the specail grille(s) will be.  

I got a few miles in on a 1:1 Bonne, and though it was a super nice car, I always thought the ribbed f.fender/door trim was gauche, esp vs. the GP.

Wick