Rear disc brake kit for 15" Vector

[kaj750]

1969 charger
15" Vector wheels
8 3/4" rear end.

Not going to be racing the car. Just looking for a basic rear disc setup. Something from summit, classicindustries, etc.
I see most kids require a 15-in or larger wheel, but I know not all 15-in wheels are shaped the same.
Is there anyone that can confirm a disc brake kit that would work with my wheels? I assume there's a number of people that have done this very thing. Any help would be appreciated. Thanks, in advance!

 

[Kern Dog]

Generally speaking, the size of the rotor PLUS three inches determines the minimum wheel size.
The Dr Diff 10.7" rear disc kit can accommodate a 14" wheel.

 

[kaj750]

Generally speaking, the size of the rotor PLUS three inches determines the minimum wheel size.
The Dr Diff 10.7" rear disc kit can accommodate a 14" wheel.

I just want to be sure because the inner barrels of 15 inch wheels are not all the same. I'd be stuck with it because I have to install to find out (the hard way lol ).
But, if a break kit fits a 14-in wheel that I'm good to go. That's a great idea, thank you.