Ah oke then ...
I didn't know that that they have the same high as the support blocks.
It's also logical now when you said it ...
I already unpacked the gauge, so send it back is no option Adrian.
ive been looking now....
with the 107711 you have to use (from hudy site) the 107701 , thats the 20 mm chassis block.
So if the 0 on the 107711 is the same as -10 on the 107717 (these are using with a 30 mm block) then it is indeed the same high of 30 mm , and they have the same high.
So I can use it for now , only the 10 on my block is actually 0 when I use the 30 mm chassis block.