Zambesi Auto is easy to find. Take the N1 north, turn off at Sefakho Makgatho (formerly Zambesi Drive, but Sefakho Makgatho Auto is just not a good name for an upmarket dealership I guess). Go through the toll gate and turn left.
Go down Sefakho Watsenaam. Builder's Warehouse will be on your left and there is a BP on the right. Go past the first robot that turns to right only. At the next robot - a major intersection - turn right into Breed Street. Zambesi Auto is on that NW corner, i.e. on your left as you go down Breed. It is inside a great big motor city complex. The entrance is at the first traffic circle.
Hopefully my old school non-GPS directions helps. :smashScreen: