I grew up with my Suburban while it ran it's OE lock ring wheels, and every time my Dad had to get it serviced at the local Firestone shop they would groan.
My Dad always complained of having to pay a premium, and I always complained of having to wait in the customer lounge for hours
I would love to be able to run the 1968 OE wheels, because I have always endeavored to restore my burb to 1968 vintage.
Instead, I have powder coated a set of 16" steel wheels black just like the 1968 OE lock ring wheels where from the factory. Someday I will even go as far as to do a little pin striping on the wheels, so that they "look" like the old lock ring wheels.
They are truly dangerous, and you should look for a set of 16" steel wheels that best match the dimensions of the OE lock ring wheels.
Here is a accident report of a man killed while pressurizing a lock ring wheel on a excavator (yes lock ring wheels are used on heavy equipment as well).
http://www.health.ny.gov/environment...ce/07ny137.htm