When I did mine I had to make all my own gaskets. I sourced o-rings and washers from champion assortments and resoldered the leaky float bowl. The special shaped fuel hose I got by cutting up a hose from a car that had one section that was, more or less, the right shape in one small section, I made a spring by pulling one out of a miniature gun irrigator garden sprinkler and reshaping it.
If you do find a source of good bits please let us all know! I would be very interested.