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Do those 375m rims have same hub size? AFAIK rears from x5m/x6m may differ, but I'm not 100% sure on it
If hub size is same and rims are centered on the hub (hubcentric) - then it's your rear tires that are worn and possibly have uneven circumference - thus it wobbles from left to right. If you can jack up each rear tire at a time and give it a spin (probably has to be in Neutral gear) - I'm sure you can see one of them (or maybe both) wobble
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