long wheel studs for factory discs

I don't think your gonna find long whell studs 7/16 inch diameter thread size for those KH disc brakes anymore in this day and age.
Whats available works for Drum brakes and not discs.
Here's what i once did for long wheel studs, on the KH brakes.
I had my machine shop friend just drill the rotor and hub to a larger diameter to accept wheel studs from the 70 71 72 B & E body line of cars, with disc brakes.
The studs are then 1/2 inch diameter, but so what. You buy 1/2 inch lug nuts, to suit your application, and wheels.
Then long studs are pretty much findable for the 70 71 72 disc brake B & E body line of cars.

Well anyway, that's my 2 cents worth of reply to your posting.
Good luck.
Jim V.
hemi71x[/QUOTE]

For my 70 Duster with KH front disc w/ 8 3/4" rear end.
I did the same. Moser axle drilled my KH to the larger bolt pattern and for 1/2" threaded studs.
Got rid of the smaller right and left studs.

You can get redrilled rear axles also. To use stock rear brakes. IIRR
So you have to redrill your drums too.

I bought new axles with the BBPattern for the rear, the flange plate is bigger, but if you do it this way, you have to change out the rear brakes to a larger size, and to larger drums with the correct pattern.
If I remember right.
So I just went with summit disc in the rear, with green bearings which are required.

I think, The axles they have listed are the racing axles,
They make a cheaper one, may have to ask, which is what I bought.
I also bought their threaded studs and bearings. They installed the bearings, free install, and threaded studs, and I bought it through Summit, so no shipping charge.
Something to think about.
There are a bunch more rims to choose from, with 4 1/2" bolt pattern.
Hope this helps.
Moser Engineering - A-Body Axles - MOPAR Car Axles - MOPAR AXLES - Axles - Stock Application