Transit wheels

[wolfsden]

Ok so I just picked up a set of 22 inch transit wheels, after taking some measurements I can see that I will need to run a 1 inch spacer in the fronts and a 2 inch spacer on the rears.
I also read here on some threads that the center hole on the transit wheels need to be machined a little larger to fit the hubs, which I can see when I removed my existing wheel to try and fit my new transit wheels.
My question is since I need to run spacers both front and back I'm assuming there is no need to have the holes on my transit rims machined bigger cause the wheel will be sitting up against the spacers and not the drum hubs in the rear and disc hubs in the front. I didn't purchase the spacers yet so I am not 100 percent sure.
My other question is about the spacers. The studs on my hubs are a 7/16 thread but all the spacers I see have a metric stud thread is this the only way you can by spacers? I know I can get 7/16 lug nuts to install the spacers to my hubs then I would have to by metric lug nuts to install the transit wheels to my spacers, I am looking to install this cap set in the picture on my transit wheels and the lug size only comes in 7/16 see pic.
Thanks for helping.