You can fit the wheel without the air bag inside the centre.
Just buy one that is all complete and pull the bag out.
The point was if you were looking at a momo you can fit any off the shelf momo as you didn't have a air bag from stock.

Doesn't matter either way, just gives you some choice in style of wheel.
And they (if ADR approved) will be just as legal as the 99-00 momo.