obviously a bit longer, being that you are adding 8mm of material. of course the factory nuts sit down quite a bit to give you some room for added plates but If I remember off hand, "don't hold me to that", I think I grabbed studs off of an old Tecate motor I had.
Like I said, It's been quite a few years since I did this mod so I am trying to brush off the cob webs.
It's a really nice mod, once done!
I didn't have the verbal help to guide me thru this mod when I did it so, I'll do my best to help you.
It is a nice reliable mod if you do it correctly. I haven't rebuilt my crank or top end in over 5 or so years.