Does anyone have recommendations of who on EBay sells flat #41 sprockets with 30, 20 and less teeth. I'm buying more parts for my 4wd & 4ws pedal powered cart. I'm going to build a cassette like on a 10 speed bike but with Gokart sprockets. I have a 60t, plus 48t & 40t on the way. I am going to assemble them with spacers between the sprockets just wide enough that the chain won't fall between sprockets.