Carrera Kraken headset size help needed

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Dear All, I have been given a Carrrera Kraken frame which I'm building up & it needs to have an integrated headset but seems the frame is designed for quite large bearings (I have a Cane Creek 1 1/8" integrated but the bearings are too small in the frame, wobble about, don't fit snug and hence I can't get it adjusted right - either too loose or too tight). Does anyone now what were actually fitted in the originals so I can see if i can get one. Or where their collars or something put in the frame first? Hope you can help.
Cheers
lou