Where is the oil plug for dyna low rider?

There are two drain plugs on the underside of the transmission pan. The one closest to the left side of the bike is for motor oil and the one closest to the right side is for transmission oil.

The motor oil filler is the large cap just above the transmission on the right side of the bike and the transmission filler is a plug with a hex hole on the front side of the transmission end cover, also on the right side of the bike.