What can be said about the 4-speed New Process NV833 overdrive manual transmission?

[Gregski]

ok wanted to share some close up pics of the bellhousing

now see how this bellhousing has six transmission mounting holes, I heard people refer to it as dual bolt pattern, as in you can use it to mount two different transmissions to it depending on what you got, so like a Muncie SM 465 would use four bolts and the New Process NV833 would use another four bolt combination

However, and you will see this when I post the pics of the transmission, my New Process A833 (or what ever the correct model reference is) actually has the matching six bolt holes.

So the 64 million dollar question is do you need 6 bolts to mount this beast?

and guys be gentle if I am driving you crazy with dumb questions I am trying to learn something here, and maybe help others too if they come across this later on in the future, thanks