New tent?

I’m in Canada, buying a used 2017 Go this weekend. The sky view windows have not been an issue, I’m told. I will very carefully inspect everything. I also plan to stick close to urban for the first few trips and rainstorms.

If I wanted to buy a new tent portion, where would I go? Cost (in usd?)? Installation cost/work? Pros? Cons? Does it fit on the ‘17 trailer?