Mustang Depot has a new billet grille for 1969 Mustangs for that horizontal look.  From their site:

“These beautifully designed Billet Grills mount in the existing grill locations and add an awesome, custom look to your early model Mustang. Our grills are welded and utilize 30-40% more billet bars than the average billet grills on the market. This feature provides each grill with tight spacing, a near perfect fit, and a stronger more durable product.” 

Mustang Depot's 1969 Grille