Motor mountsg block truck?

I have a pair of motor mounts I am trying to ID. I believe they are for a big block truck?

Common design for the 70' and 80's in trucks.
The mounts that I have, including those still attached to a '76-77 B engine, show a slot that is right close to 2" in length on both pieces.
Cannot find any A-LA mounts right now.

The difference between the small block mounting brackets and the big block mounting brackets is the distance between the holes for the mounting ears at the motor. The mounting ear holes on a big block are farther apart then they are on a small block.
In the picture, the bracket on the left appears to be a small block bracket, and the one on the right appears to be a big block bracket. Gene

I never woulda guessed. Sometimes it ain't what you know its WHO you know!

Shouldn't both mounts be slotted? The one on the left lacks the slot. I've never seen that before.

The sandwich rubber mounts with the interlocking feature usually have the brackets with the hole and the nub to orientate the rubber mounts correctly. Guess that was probably cheaper the punching the slot. Gene

Those are 1972-80 2wd and 72-74 4wd.
May be the same as 81-93 2wd???

Thanks for the information. It does look like one of each. The slotted one is about 2 1/2" inside to inside and the other is about 3". Not sure how I ended up with that? Anyone need a mis-matched pair of motor mounts? LOL