"That was the factory screw holes"- I hear you. It was probably built by the same guys who installed my rt trunk floor extension a measured 3/4" lower than the main floor. Let's just paraphrase that the old slogan "quality is job one" even though a Ford deal, was not followed too closely by Mother Mopar back in the day. My concern was that if the support didn't match the glass to the moulding clip, that there was a chance of possibly banging the glass with the mldg when installing. Tempered glass is amazingly durable, but the fastest way to kill it, is to hit it on an edge- pow!