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I recommend you buy a replacement overflow bolt. The overflow bolts are prone to issues.
- 5mm Hex (for overflow bolt) Part# 31361-1XJ0A
- 19mm Socket (for drain bolt)
 
Thanks, but I need to know the thread size or size of the hole.
The ATF filler adapter shown above indicates it's a M8*1.0, so I assume the overflow bolt would be 8mm with a 1mm thread pitch.
 
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