I need to replace my 25 year old Quasar Easy.Matic microwave. My biggest concern is whether vent holes can line up with a new one. Do you have an installation manual for this 1986 model, possibly NM61570021 or any general information about how Quasars were mounted with respect to vent? Hopefully side rails information too. Inner dimensions tell me that my unit is just a hair over 1 cubic foot in size. Outer dimensions are 29.5in wide, 15" tall, and 15.75in depth from wall to front panel.