Rack and pinion will be Chinese. Have a look on AliExpress. If you open up the controller box and find that the BoB and drivers are connected by IDC ribbon cables and the Bob and drivers are made by Tonman they are obsolete. If you have any driver problems send me a picture of the driver showing any model number and I will look in my keep boxes. I have three of them somewhere if they are the drivers I suspect they are. If you need them, you can have them for the postage costs. Otherwise you would have to go the route I went when the BoB fried and replace the lot with standard kit. If you are running 48v then you would probably be better off going to a higher voltage at the same time.