Just a question. Would Anyone know if the predrilled lock/doorknob holes on steel entry doors are set at a standard height in the industry? i want to replace my steel entry door with a steel door that has a 3/4 lite (window). I can find the glass/door style ONLY in a pre-hung but I do Not want to replace my whole jamb/frame because my existing entry has a side lite. to replace the whole thing would make the purchase $1k+ whereas if I can just replace the prehung steel door with this new prehung steel door it would cost about $400. The other issue would be the hinge holes...I was thinking of keeping the new hinges on the door and adjusting any holes on the jamb.