Quote:
Originally Posted by Dynomite
Hi Dave: I am always a bit different as you know 
The Oil Drain Plug .................9/16 is .5625 inches (14.2875 mm)
The Battery Cable bolt .......... 5/16 is .3125 inches (7.9375 mm)
Just now I had to go out and confirm on two ZR-1s 
For the Oil Pan Drain Plug the 14 mm actually fits just a tiny bit tighter than the 9/16 which is good.
For the Battery Cable Bolts to Battery Connection the 8 mm fits just a tiny bit more loose than the 5/16 which is fine.
Both the 14mm and 8mm flex head ratchet box open end wrenches are perfect for the set of Tools to Carry in the ZR-1
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Yes I do know about the bit different LOL and having NOS drain plugs BUT having always used a 9/16 box end I had to take a NOS drain plug and try the M14 after seeing this thread. An M14 wouldn't fit the NOS drain plug. An older drain plug is quite likely a fit. It's been a few years since we discussed the battery terminal bolt hex requirements.