Like I said cross reference the 79 silver bird for part numbers,because it came with the 455!!!I know all you will need will be listed on that model!!!Just because the motor mounts came on a silver bird does not mean they are 3 times the price They may be ,but crossreference the part numbers for similar parts on normal models and or cross over part numbers.I have rode in and driven the silverbird and it needs nothing more than the factory set up to scream!!!455 ,4 speed,4.11 posi,what more needs to be said!!Other than roll cage,frame ties and safety safety safety!!!!!