Get the proper size. I would also be a little concerned about the tire being on sale really cheap, check the date code before you buy it so that you don't end up with a tire that is 4-5 years old.
I'd love to, but I can't right now afford a $90 to $140 tire. I've had very good luck with this brand and seller. It's a Shinko from Bike Bandit. I'm having a very hard time finding an exact fit in anything but expensive tires. I also am not using this for long trips, just around town and it's part of a broader bunch of getting my cars running so I can sell one to pay to have the other fixed and insured. I need a tired that works, gets me around town, at most an occasional 60 mile round trip, maybe once every three months, and that's only IF I din't get the car running. IT's also likely a temporary fix to have things running and roadworthy before I spend more time getting things in more optimal shape. Sometimes making the money stretch and go a bit father takes priority over having things perfect. I can also better afford the new chain and for seals I need.
IDK with motorcycles, I used to think with cars fatter tires meant better handling, but a few years ago I owned a 1990 Mitsubishi Mirage. IT had the skinniest car ties I have ever seen. They were standard fit for the car, tiny 13"s that looked to me not that much bigger than your standard doughnut spare. That car though had AMAZING handling. In any case, these days I ride slow and cautious anyway. I don't push things at all like I used to in my youth. The only guilty pleasure I ever indulge in is quick acceleration. I'm not even talking spun tires or wheelies, just get up to the speed limit quickly, no more.
So if a non perfect fit tire for a season's riding helps me get more parts for the bike nad more progress for my cars, for now i'ts prolly the way I need to consider going. I'll keep looking, not making any immediate for sure buy, but in next day or two I will.