Wouldn't you want an overbore gasket for a ZX1000R? The one you have shows you going to 972cc. I believe when you go with the ZX1100 pistons it goes to 1052cc.I did a typo, 1999 ZRX11 pistons, 1988 ZX10 rods, followed this
When I did the overbore with the ZX1100 pistons on my 99 C10, I used a new stock head gasket and opened it up some with a dremel till it was just bigger than the cylinder bore.