I got some News. The guy found a 302 top-of-teeth to top-of-teeth diameter w/ 120 teeths. he said that ''E30'' is written on it.... what does it means if it means something ? I went to my local Nissan dealer. A brand new flywheel is 400 canadian $ A ring gear alone is 120 Can $ Now i just need to figure out what is the best option -a new ring gear ,rust-free,with a little warranty(if it dont fit i go back there...) =120 $ - a surface rusted flywheel that might not be the right one ,with shipping($$) =depend how much he sells it ,if he tells me one day (...) both will need to be resurfaced anyway Thank you for your help ,