looking for the rubber pieces on my 05 f150 on the ends of the cowl

 

Your best bet would be the dealer. You may be able to find them at your local body shop jobber. I found the end push in fasteners for my cowl grille panels at my body shop supply store for $6 for a bag of 25. I didn't look to see if the rubber pieces were available. If the rubber pieces aren't serviced separately by anyone, then you'll wind up at your local salvage yard to get them.

 

Those two rubber wings come as a part of the left and right side cowl. You'd have to order the entire thing to get both. I've run my truck for almost 2 years now without them.