OsterReplacement Blade for Electric Pet Grooming Clippers, Size 10

does this include both pieces? there is a front and smaller back piece on my oster 151_04 A. do i replace the smaller back piece separately?

What size blade do i use on Golden Retrever to levave 1/2 inch?

Is this compatable with the oster a5 clipper no. 80 fw size 10 blade? i bought the clipper back in 1990, just need a new blade

Is this for the Oster A5 ?