Mines an 856 with vector 2, so yes, I've an 856 with a crosslink fork from an 857 which is a1 1/8 headset and an 1 1/8 steerer so no spacers at all just normal fitment!!!
My 857 with Girvin Crosslink forks was the same, it had 1" 1/8th steerer so a regular 1" 1/8th headset (top & bottom cups) was all that was needed.
It's not the frame that's the issue here (I don't think?) it's the forks, specifically the steerer. As mentioned above there's a few options you could try with reducers for the headset (to go from 1" 1/8th down to 1"), or spacers to put on the fork (I had a set of Girvin Crosslinks which had a 1" steerer and used spacers to allow a 1" 1/8th headset to be used), or of course you could try and find a replacement 1" 1/8th steerer, although they can be tricky to track down. Or you could keep an eye out for another set of Girvins, or just fit a different set of forks with a 1" 1/8th steerer on them (I fitted some Pace RC38's to my 857).