QUESTION? What Engine Mount Brackets Do I Have?

Found these engine mount brackets buried deep on one of the storage shelves, out in the garage.

Haven't got a clue to what year(s) they may fit, bit i am assuming they are small block mounts.

And i don't know if there's any difference between the A, B, C, E, body cars.

Anyone care to look at these pictures, and tell me what they are for.

Thank's a lot.
Jim V.
hemi71x

EDIT: From post #8.
Do i have a mix matched set of mounts?
A big block mount bracket, and a small block mount bracket?
That why holes are drilled on the other side on one of the brackets?

Member Lemondana has informed me, that the mount pictured on the right is a 383-440 big block mount bracket.
That would explain why the holes are drilled on the opposite side of the one that i have, other than a small block bracket.
Thank's everyone for your input, with my inquiry.

I have come to the determination, that i have both a small block bracket, and a big block bracket.
Been decades ago, since i wound up with these parts, so i don't remember that far back, how i got them.
Probably just lying on the ground at a U-Pull-It wrecking yard, back in the dinosaur days, just waiting for me to pick them up.
Thank's everyone.