NEW CT90 ATC90 ATC110 ST90 NEWER STYLE HEAD GASKET 12251-028-790 (83w)
 
THIS HAS CUTS FOR IT TO CLEAR THE STUD BOLTS
ID = 53.5MM OD = 69.0MM
 
THIS HEAD GASKET WORKS FOR (CT90K5 THRU 1979) OR AN ATC90 WITH A ENGINE SERIAL NUMBER LARGER THAN 1113934