Hi,
67-1210 is the parts book number for engines post DA10 7801 or DA10 R 101
the casting number will normally be be different from this by one,
Peculiar then my SR has 67-1210 cast on the front left hand side upside down ??
67-029 is cast on the back of both thick and thin flange cylinders
67-1074 is cast on the front of a thin flange cylinder in the workshop ( I dont have the early parts book to check the part number)
HTH
John