Hi just ace.
Yes, its right up in the oiling groove is wider and then they fit a support rail (its just like another ring about 1mm thick that sits below the oil control ring assembly) to help support the oil control ring over the gap.
Some of the chev people that commonly use pistons with the oil control ring cutting the wristpin bore claim a little more oil consumption which I guess is due to slight flexing of the oil control ring. IMHO it'd be minimal, as the ring set is only scraping oil on the downward stroke under which circumstances it is fully supported by solid piston material.
Here is a picture of the pistons. I have to get another set as the valve reliefs are not big enough for my valves and recutting the pistons for larger relief will make my compression ratio lower then I'd like. Have had these for sale for a few weeks, suprised you didn't see the pics in that thread..