K1-K4 forks have sort of "built in" spacer. Newer bikes have separate spacer. The wheels have the same dimensions. Part #6 https://www.partzilla.com/catalog/suzuki/motorcycle/2004/gsx-r1000z/front-wheelI'm not sure exactly what it refers to but the different values for Fork Spacing At Wheel Spindle Clamps does not sound encouraging
I fitted a set of non-abs monoblock cbr tokico's and m/c for my K6 years ago,before the m/c recall. I had a friend machine 14mm aluminium spacers.Use the K9-L1 Suzuki calipers. These guys race with them. I think that the Hondas are essentially the same but years ago I spoke with a Honda rep who said that their ABS Tokico calipers are different from the non-ABS. Never looked into it but it seemed best to stay away from them without further info. Plus the Suzuki calipers use the same pads as K5-K8 while I think the Hondas use their different sized pads. As said before, you also need a matching (17 mm) MC.
Huh? It's either made from a single block of aluminum or it isn't. What am I missing?The Honda CBR 1000( and several other Honda ) 2008-2015ish tocigo one piece calipers are a better option. They are more or less a bolt on and they are "billet" construction ( not real true billet but as billet as any non Brembo calipers are ).