The 306, 206, and 319 all use an "L' bobbin. I think I got mine from Sew Classic. They also all use a 206x13 needle. Some people have tried to put in a 15x1 needle, but you will mess up the timing if you try that. I'd get the correct needles for your machine. The needles and bobbins are not expensive, but you won't be able to buy them at your local JoAnnes, or Walmart. I treadle my 319w. I don't even have a motor for my machine. Those are great machines, easy to work on - I have had to re-time my 319w twice after my grandson did a number on it -, and easy to use. Did you get the cams?
Nancy