Hi guys,
You can do this mod yourself, if you access to a drill press. Drill out the existing holes, with a 9/16 bit. And spot face with a 13/16 counter bore.
Cut the studs to the correct length before you install them. Press in most of the way, pull them into their final place with the rim and lug nuts.
Easy peasy!
I also like to cut the knurl down a little bit. Makes the studs a bit easier to install. Also makes the knurl concentric to the threads.