Those are engine to trans braces/support brackets. 1 for each side....
The Two sets I have are from a ‘67 273 and ‘68 318 And they are both the same. They are both different leangths so you can’t mix them up.Hard to get a good picture of them installed. On my 67 Barracuda 273
Passenger Side:
Driver Side:
View attachment 1715207284
There seam to be a couple different styles, the previous post shows a style that is different than I posted above.
I'm not sure what years each style are for I have a few sets from 66-73, don't recall which ones came from which cars.
Alan