Ion is a shit wheel man. Yours is a common problem with drilled blanks.
Buy a name brand(Method Moto Metal etc.) and you won't have this problem.
Don't get me wrong, I'm not talking $1500/ea forged wheels here. Matter of fact, they're all made in China.
They simply are sized correctly from the get-go, as opposed to being a drilled blank
Oh, and FWIW, I bought a set of spacers for the Colorado off Amazon.
They're not hard to find
There seems to be 2 definitions used interchangeably for wheel spacers.
1: Wheel spacers, a small pass through slab of metal that pushes the wheel out slightly (less than 1/2") used to clear calipers and such using existing studs.
2: Wheel spacers (wheel adapters), having a full new set of studs and holes to mount to existing studs and pushes the wheel out 1.25"-2". These can either keep existing hole pattern on second set of studs or change to a new hole pattern.
FWIW the second type of "wheel spacer" (wheel adapter) is readily available for purchase from many places (Amazon included). The first definition of "wheel spacer" is not so easy to find for the twins.
Since I was already using a +6mm wheel offset (about an inch more than stock) it was not to my taste to push the wheel out another minimum of 1.25" making for over 2" farther from where the stock wheel started.