Report Cow catcher bumper removal. in 1965-83 Avanti Posted December 17, 2009 I did exactly that to my '81....took off the grille, unbolted the cow catcher, then trimmed the brackets off the frame with a little Mikata high speed grinder and a few wheels. I did bite the bullet and buy a brand new early grille with no cutouts, but believe me it was worth it. That new grille made the whole car look new again. I wouldn't have believed it until I saw it. I did have to re-drill a few mounting holes for the new grille, since they all didn't line up, but that was nothing much since it is fibreglass.