[youallsonice?]

For those wishing to extend a further 30days in Vietnam, bus 703 to moc bai border is NO LONGER at Ben Thanh bus station. You have to go further up Pham Ngu Lao street. There is a small bus station opposite junction Pham Ngu Lao and Do Quang Dau. Enter the station, walk along the right side, you will see a large map detailing all the buses and where they are located. Simply walk to the bus 703 location and board it. 40.000VND, 2hrs.

I'm on the bus now. Will update any hiccups/problems faced at the immigration.