Hey guys, so i decided to rebuilt engine head.... 
And straight away i noticed one issue.... different size camshaft but same size seals... 
Looked everywhere, but everyone sells only same size seals... 
And there's space 50mm 
I not an engineer but its obvious that if there is space,  there will be oil leak  
So, question: from where could i get different size cam seals? Im sure a lot of you had same problem 
Thanks and sorry if i made any mistakes,  English isn't my first language  
  
300zx TT 
1991