74-76 KX250 - KX250A3 I get 11004-065 and it shows no subs 
 
 11004-1012 replaces 11004-1007 which it lists for these models below
 KDX250-A1 (KDX250) (1980)  
 KDX250-B1 (KDX250) (1981)  
 KDX250-B2 (KDX250) (1982)  
 KDX250-B3 (KDX250) (1983)  
 KDX250-B4 (KDX250) (1984)  
 KX250-A4 (1978)  
 KX250-A5 (1979)  
 KX250-A6 (KX250) (1980)  
 KX250-A7 (KX250) (1981)  
 KX250-B1 (KX250) (1982)  
not to say it Rusty's gasket won't fit cause it sounds like it will but it may give some more options for the early gaskets which are thin on the ground 
