Okay, w8ye, I thank you for that!
So, I ordered a K-10 WYD for the walbro carburator of my Saito FG-57 from here;
http://www.m-and-d.com/WL-K10-WYD.html
Hopefully it will be here within the next 14 days or so, with a pump membrane that fits, so I can fly the Corsair again.