what is this hole??? will it come with a plug in it or at least with threads so it can be plugged??? truth be told, its a stock photo, and its a vortec style performer rpm... the one offered is the polished version, new for $172.50 SHIPPED... less than half of what it should cost... makes me nervous, but the company has a 99.7% rating and the only negative feedback i could find stated "product arrived a day late".... hell, i will wait an extra day for a 60+% discount...