Decide what features you want. Each variety comes with an assortment of features, ranging from a basic vent or manual model to a full-blown electronically controlled unit. Sunroofs also come with a variety of accessories including an assortment of shades and built-in lamps that serve as dome lights. Consult with the installer as to the proper size. Ask about the warranty.
Most sunroofs come with some kind of warranty to the original owner against defects.
Many sunroofs have watertight warranties covering water between the glass and seal. Select and purchase the sunroof and have the shop install it. An average installation can be done in less than a day. Many models take only two hours to install. Inc. How things get done.