This blade would certainly work as kebo lajer luk 7. 
 
If I remember the gist of an earlier thread correctly, luk could be added to some (even all?) straight dhapur and designated a s such. (If adding luk does not change the blades into another, more specific designation, I assume.) 
  
Some of the dhapur with luk may have different numbers of luk. If I recall correctly, some may be open to non-standard numbers, too. I haven't been able to fathom though when this might be considered legit and when not... 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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