15mm square
Just to be clear. These were extended but you need to make sure they are high quality heat treated lug bolts. Not sure what Supreme Power sells. If they are, then you should be good. A good way to check is if they look chrome like these or more like a galvanized like the OEM.
No worries. Yep, just want you to be safe. I had a buddy lose a wheel from similar crap. My mechanic said he has seen a bunch of these issues and the only ones he would recommend are OEM and H&R's. Mine were not hollow.


