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Backside of the oil pan.
Most GM oil pan drain plugs take a 15mm wrench to remove.
17mm
19mm
15 mm
Depends on the pan size if you have a stock pan five quarts. If you have a six quart pan six quarts.
15 mm
5 QTS is what it holds.
The one that fits it tightly/
Oil pan to engine block I believe is a 10mm head, and the drain plug is 15mm head.
The honda oil pan drain plug is a 14mm bolt. It's threads are a 1.50 pitch.
You need to have the hole tapped out to a larger size, and put in a larger drain plug. Or, you can have the whole oil pan replaced, which is more expensive