Ah, found it, thank you. Have not used them, but, if no one else has your fuel pump, give it a go. Is there no 'on line' store closer to your home? Even if they have the parts, shipping time and cost may be excessive. There is a 'used' full fuel pump assembly on Ebay currently, and several 'pump only parts, that may or may not work. They seem to be a replacement for the pump unit only, and it looks like you need to construct the assembly with the fuel sensor around them. There is also a crazy expensive 'new' oem pump assembly on Ebay. My local shop lists the price of the assembly at $476.99 plus tax, picked up at the store, as a point of reference. Good luck in our search!
Oh, and a google search for 20s-13907-00-00 shows several on line Yamaha parts suppliers who have the OEM assy. in stock, from about $397 plus shipping, and up.