Any wheel spacer will work, just get a reputable one. The important thing is how much spacer is and make sure you torque them down properly. Also, just know that this will create additional wear on the unit bearing(s).
I have them and the stock Sahara rims (painted black - wheels are expensive!) They set my shoes out a decent distance to give Baby a wider stance that I like for a much cheaper price than new rims. I check the torque on them every time I rotate my tires (every oil change).
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