That you would need a stud that is as long or slightly longer than your current bolt. Just think of the head of the bolt being replaced by a nut, so the stud has to extend up into that nut, through it, and then a little bit further.
Pete
Albert -
Having done this on my 128 and X, you are better off going a bit longer than minimum. You want at least eight threads in to the nuts.
Best,
Jim
Albert -
Having reviewed the invoices for three different kit orders earlier this year, they were 45mm and 52mm. Recommend you go with the latter.
Best,
Jim