Hard to tell, I know Sew Classic and Cyndi Peters (Stitches in Time on facebook) have first hand experience and know what they sell. Much the same for some ebay sellers, the trick is to identify the correct type. I think you have the small tyre the same as 99, 66 and 201. The motor belt can be a bit tricky, measure the outer circumference on the one you have and that's what you get when you order. Don't trust model listings on belts, there's too many variants, like large spoked or small non-spoked hand wheel. There's not much room for adjustment, just a bit.