Hello, I want to install an aftermarket radio (YUEHOO 7 Inch 2 DIN) for my Cobalt LS 2006, but I'm really unsure between what size should I pick between type A or B.

Type A:


Type B:


Also, where could I get a fascia panel to make it fit perfectly, and if I need any other adaptor or other component to make it work with this model. In the description says "Some special vehicles need a specific power socket, fascia panel and CAN BUS box to fit it.", but I'm not really sure what "power socket" and "CAN BUS" refers to.
I'm pretty new at this, so anything helps.
Thank you!