Use a quality 6 point socket and breaker bar(or impact, if you got one). hit the bar w/ your hand or mallet.

I bet most auto parts stores have a metric drain bolt assortment on hand. prolly not the same quality, but maybe instant gratification.

or get/ build a topsider.

__________________
1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.