5x100 Subaru hub bore is 56.1.
After market wheels have different bore.
So its always x > 56.1 hub rings.
X is the bore size for aftermarket wheels.
JDM wheels usually 60mm to 65mm as that's the minimum requirement to pass VIA/JWL standard (Japan equivalent to DOT).
If X is smaller than 56.1 I'll suggest u don't buy the wheels.
Its perfectly fine to use hub rings. Should be around $20 for one set.
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