I have just done this job using 1.5mm plate. With a bit of lube, the sprocket carrier slotted in to the new cush drives with no real problem. I did use a strap round the sprocket and to the spokes just to pull the assembly together to make refitting the wheel in the bike a bit easier. Just saying, you don't need to stress it if you can only find 1.5mm plate as was the case for me.