Thats a 98' exr blue head water jacket in the pic. So that would be a 7mm crank. They did not switch over to the 8mm till the black head came out in 00'. There were some black head 99' out there. But they too had 7mm crank.
Thats what happens when the crank breaks. Picco resolved this problem long ago. Only to repeat it 15 years later. radius the crank stepdown & it wont break.....