Spacer size for 50th anniversary wheels?

[Skymack]

Does anyone know what size spacers I'll need to have my tires perfectly flush with my fenders? I have 50th anniversary package wheels (not the limited 50th Edition) which I believe are 8.5" and I don't know the offset. Thanks in advance!

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[Nagare]

25mm works well for all the stock wheel options. My friend has them on his black accent package wheels which look to be the same style, just different color.