I can get this measurement for you in a few days if you haven't already found it. I have a '93 888 SPO.
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Yes, its a RGV 250 vj 22That is a Suzuki front end. Fork brakes wheel
Here is what the fork leg looks like from the 888 SPO, same fork that was used on the 900SS of that era. The fender mounts seem closer to the fork leg than what you showed.
View attachment 32902
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Yes I thought that. Thanks for your help.
I will post photos when I adapt the front fender.