George
Thy look very similar to the GNV ones. From the photos, it appears that the stand off bars on the GNV are a bit further out from the vehicle, which enables their use as a sidestep (with non stick tape). The cross section diameter of the tube may be a little less, can't really tell from the photos. I think (from memory) the GNV has four cross members between the slider and stand off (need to check this when I get back home). I'm not sure for the photos wheter Oldsalts are like this, but the rear of the slider part of the GNV is closed off.
Otherwise they look much the same and would do the same job, no doubt both products look good.
I wish I had a trolley jack when I was fitting mine.
Cheers
Mike

