Working on a factory 383 '69 'Cuda, the left side motor mount insulator has the 4 stud unit and is pretty thick, I was trying to use a 340 insulator on the right side but the stud won't line up on the K frame and the rubber seems too thin compared to the driver's side. Anyone have a pick of the correct insulator for the right side? Or a part number for the correct one? Pic of the insulators.
Thanx.

They are the same mount, steel and rubber, as the 1965 C body BB mounts

Can you spin the rubber 180 degrees? I had to spin mine in the 440 Valiant and it dropped right in. Sometimes you can spin it 90 and it will work.

If I'm not mistaken, the passenger side mount (isolator) is that same as '69 B-body.

I tried that, if spun it stays just like it is because the other stud is located at the bottom of the steel mount, so if spun the studs are in the exact same position. Plus, It's not near thick enough, the engine will be setting slanted towards the passenger side. I guess I could call it a slant 383.

Yes that's correct, the right side rubber mount is the same as B&E Body V-8's
That what our 68 383 GTS has on it.
Here a pic of it, it uses the hole that goes front to rear on the K-Member.

Thanks to all that replied. I dug around in my parts stash and found one that fit perfectly and it looks a lot like the driver's side.

I believe the passenger side has a lower steel saddle that a through bolt goes through into the k-member.

Found this in a quick search of the site.
https://board.moparts.org/ubbthread...big-block-engine-mounts.html#Post1943528

The 1969 M code 440 A body driver side motor mounts, both steel and rubber, are not the same parts used on the H code A body1967 to 1969 Cars also

Actually an M-Code drivers motor mount is made from a 383 A-Body mount (originally used on a 65 C-Body big block) by bending it out, lopping off one of the mount holes, and adding a 6" piece of angle iron welded onto the top of the mount and drilled for use on the 440 oil pump boss that is drilled and tapped. The rubber biscuit is the same 383 and 440.

You wouldn't happen to have a pic of that mounted to a 440 block?

Sure...

Here is a pic of a factory block with the drilled and tapped holes in the boss's of the oil pump mount...

Looks like the block I gave you with the Mcode dart ?

Chrysler did this because they eliminated the bosses on the block casting under the cylinder head that were used for mounting 440's in 65 thru 68 C bodies.

that's not the right mount , they used the B body mount on the pass side , I'd replace that one and save that mount for your drivers side in case you break it .

Not the block that came with the M-Code I got from you, that went with another M-Code I sold a couple years ago. This block was from a 68 GSS Mr. Norms car that I still have...