Wheel Spacers and Adapters are two different things. A spacer will bring the distance from your wheel and the cylinder out by as much as 1/4" - anything more than this is unsafe.
Many auto part shops carry spacers and most wheel warehouses use/install them on several cars each day.
A wheel adapter is 1" or larger and attach to your cylinder by way of lug nuts - you then bolt your wheels to this new wheel adapter's lug pattern.
By using a wheel adapter with the same lug pattern as your original, you push the distance of your wheels out by an inch or more.
Most manufacturers, even Porsche and BMW, leave extra space between the wheels and the fenders, to suit arcane regulations or to leave space for flapping tire chains. These Light-alloy adapters are used to push your existing wheels or even your hot, aftermarket alloys out to fill the wheel-wells or your custom wide-body fenders properly, giving you better cornering, better aerodynamics and even better looks.
Wheel adapters have two uses; they are used to push the distance of your wheels out further by adding an adapter of the same bolt pattern to your existing factory hub-wheel setup. Or They can also change your bolt pattern from a 5x100 to a 5x114 or even 4x100. prices for these range from $300 to $400 (a set of 4 x $75 to $100 each piece at 1" each), and are difficult to find (Pepboys, Autozone and most import shops don't carry these - you'll have to call around to many specialty shops to find these)
Installation is simple; remove your wheel, set one over your existing bolts, use an additional set of lug nuts to tighten them down. Then place your wheels over the adapter's bolt set and tighten those down. About a week later, remove your wheels and re-tighten your 1" adapter now that it has settled - then replace your wheels and you are all set
These 1" wheel adapters with 5x100 pattern can be purchased from...https://www.celicahobby.com/catalog/product_info.php?products_id=189