Forgive my stupidity

I'm  a bit illiterate when it comes to wheel sizes and aftermarket wheels. Here's what my current situation is.

I have a 2006 Scion XA with the stock 185/60/15 steelies and tires. I currently have "New" 13 year old tires on it. They were removed from a similar car when it was new  and stored in someones garage. I got them for $25 and so far they're working fine. However I'm worried about the whole "expired" tires thing. So I'm looking for new tires, but I've been finding wheels and tires that are in decent nick for the price of new tires. So I figure i'll upgrade all of it. Here's where my stupidity comes in, I know nothing about what will fit and the resources i've found are seemingly sketchy. So my question is, will this fit? I found a set of wheels that are 195/55/16 so my googling shows these will fit but what say you? 

Here's the link I found that shows they fit. Link

The bigger question is the wheels. Offset, bolt pattern are huge. If they are wrong, not much you can do. Can you post a link to the ad?

In reply to Dusterbd13-michael :

The ad doesn't state, offset wasn't mentioned but center bore was 56. I know for certain I need 4x100 and these are 4x100. 

https://www.facebook.com/marketplace/item/408265386732311/

Center bore is something easily overlooked.  Good thing you know yours.

Google says your Scion has 4X100 wheels.  As FWD, back spacing is important, so lay a straight edge across the back of the wheel and measure down to the back of the hub.

With a 6" wheel, 3" of back spacing = 0 offset.  FWD cars tend to have the offset more outboard (+, -, I dunno).  4X100 is a common size.   Poke around here.  

Easy way to find out what offset you need - go to Tire Rack and see what they suggest. 

Also, you're not likely to find a lot of references to backspacing on 4x100 wheels. That's more of an old domestic thing, and old domestics don't use 4x100 wheels :) The width-agnostic offset is going to be a lot more common. Expect most to be in the range of +30 to +45.

back spacing is an easy way to compare wheels.

 alloy wheels have the offset cast in.   Steel wheels not so much.

Backspacing is one way to compare wheels, but without offset or wheel width it’s only one number. Same with any of the others - you need two to get all the information. Older cars tend to use backspace, modern tend to use offset. 

With backspacing alone, you know how much clearance you have on the inside of the wheel. With offset alone, you can figure the  effect on scrub radius. Add in wheel width and you can derive one from the other as well as figure fender clearance. 

Found these - https://sanantonio.craigslist.org/wto/d/san-antonio-4-lug-universal-4x100-4x114/7012640944.html

that I think fit the bill. Based on Info gathered from this Site, these fit on 1980 and above civics which they appear to be on 97ish model. What say you based on the ad? 

In reply to Keith Tanner :

Backspace and offset are essentially the same thing, just measured in a different way.

Also backspace is usually measue in inches while offset is measued in milemeters.

As Keith said, go to TireRack.com.  You can select the color of your car and switch the wheels to see what it looks like.