There is no standard 6-135mm bolt pattern. Bolt patterns are usually described as either a 5-lug or 6-lug pattern, with the number representing the number of lug nuts and the measurement representing the diameter of the circle formed by the center of the lug nuts. A 6-135 would imply 6 lugs spaced on a 135mm diameter circle. This is not a common or standard size.
It's possible you've encountered a misprint, a non-standard application, or a measurement taken incorrectly. If you can provide more context (e.g., the make and model of the vehicle, where you found this information) it might be possible to figure out what the correct bolt pattern is.
