California T3 head gasket

Having had a smacky sound from the left cylinder of my newly acquired T3 California I did some probing and discovered compression way down which turned out to be blown head gasket. All looks well other than this. However purchased new head gaskets only to find when beginning to reassemble the head that the gasket doesn’t quite fit. Not exact same pattern as the original. Checked the piston and barrel classification which is C and measures the normal 83mm. Anyone had this experience. The push rod holes would line up but the smaller oil way to the lower left is a couple of mm out and virtually all the stud holes are 3-4mm adrift. Planning to send my original back to GB with the new gaskets to see if they can shed light on it. Could be just a case of wrong gaskets sent.