I don't think Sheba is wrong, I think there is just a misunderstanding. It appears that you can get the H3 without any clearance/marker lights. But you can also add them as an option but this option is a plastic valance that mounts across the front end portion of the roof and contains the clearance lights. I think that is what Sheba is alluding to.
I would imagine that this is the most economical way for GM to provide the look. So, yes, you can get the clearance/marker lights but they will be on a "bar" that is molding attached to the roof and this will be a dealer installed option. Here is the description for it:
<UL TYPE=SQUARE>REGULAR PRODUCTION ACCESSORY, MARKER LIGHT BAR, ROOF-MOUNTED (SPO-supplied, dealer installed) (Not available with (UNJ) Regular Production Accessory, Lamps, off-road, roof-mounted.) Code: UNH[/list]