I got the Para bases (the ones I linked in a previous post above) in the mail today.
They fit the mag and gun good without any modification and stick out more than the factory or aftermarket ones.
Again, right is the factory mag, middle is the aftermarket, and left is with the new Para extended pads (link in one of my previous posts).
They say they do not add any capacity, I didn't try yet but I think they might.