I can appreciate that but I was reading another thread: "Replacing the spark plug well seals in the valve covers" and the instruction are good on how to replace the seals using the drill out method. Also here is a utube from R & D on how to DIY. The cost for the seals are very cheap vs the covers.

 

Well its your car but after consideration I concluded that that was not a good idea for my car. I don't think method would last very long. Good luck either way man

 

The 350z valve covers should be interchangeable with g35 valve covers so following 350z instructions should work

 

Thanks dat_skyline