I have a set of 16x7 +48 and they fit. According to wheel calculator 16x6.5" should clear.
https://www.ft86motorsports.com/wheelitfit/
I used a set of altimax arctics on my SX4 years ago. Probably a different variations/evolution but I was impressed with their performance for the price.
I got a set of Continental Vikingcontact7 for $134 a tire off 4tires which is an absolute steal. They retail everywhere else for $160 a tire. Pretty much won/top 3 in every category tested with other top Nordic tires including Hakka R3, ice zero FR, bizzak SW90, X-ice i3