new brake calipers

[kinkyfreestyler]

Hi everyone ,
I have a question , I have just bought a pair of nissan calipers, off a 2022 z900 with just 23 miles on the clock , before it was written off. for a small amount of cash so that made them a no brainer .
I'm fitting them to my kr, which is fitted with a modified zxr400 front fork .
Now here the problem, the original brakes use a 12mm bolt but the z900 calipers use a 10mm bolt ! so the question is ,do I buy an 8.8 drill and a 12mm tape or use sleeves in the fork bosses ?

What do you think
Thanks