Oil cooler removal

[Nihil004]

I recently bought an oil sump for just 20 euros from a local partshop. He told me that it was from an H model, and I want to fit it on an L engine. The thing is that the holes for the oil cooler are not drilled from the factory, as seen in pictures. My questions are:
1) From which model exactly is it? Was there any H model without oil cooler, but with the holes waiting to be drilled?

2) Does the lack of holes prove that oil bypass works just fine, without any problems?

http://imgur.com/Rn03Bb2

http://imgur.com/ZcwZVFr

[cargo]

I'd guess that sump is off a G model ZX400 or whatever that stupid one was before the H came along

Proof that blanking the holes works can be found in the oil flow chart in the manual or in years of my own personal experience

[Paul RF]

Interesting topic, just past the time I could have done with seeing it. Radiator and oil cooler on mine were pretty much cable tied on, have just bough both from someone who was breaking a bike. Oh well oil cooler surplus to requirement or spare if it goes tits up. Going to order those blanks though