FOUND IT !!
I had the same problem. The pictured Plasti-Kote bottles that are in the forum are discontined. The replacement ones that look like them are Plasti-Kote number 1519 (small sticker on the back of the bottle). The bottle says Truck and Sport Utility. You can find the paint cans at your local Walmart in the auto section. On my way home I saw a 4.8 X5 - I stopped, took the spray paint can out and compared the cap color to the grill color and they are similar. Let me know if you need any further information.

I just got done with mine and they look great !!

Good luck !!