Re: 38" rear spare tire
Any tire should fit fine height wise (35, 37, 38, etc).
The backspacing is what's going to be a minor issue. The OEM arm is designed to mount a wheel with 5.5" BS. If your BS is less than that you may find that the rubber of your sidewall doesn't actually touch the metal of the carrier when the tire is mounted...basically the tire will sit out a little further.
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