Length shouldnt change to much, your allowed some play.
If you stick your bolt through your orginal wheel while its off the car and measure the distance it sticks out, that is how much you want on your new wheels...
OR there should be the diameter of the bolt in length holding it in place (so in my car, M14 bolts, there should be 14mm (or close enough) holding it in the hub.)
Be more worried about the seat type. OEM wheels have 'ball' seats where as after market might have tapered ones...
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