That's a sweet find, Hogsy, and a nice bit of history too. Congrats!
I once got connected with a complete hardware kit for the SS Performer (not the bale and bracket, but every other bolt, nut, and washer, plus the lid rollers I think)... the CS lady at Weber somehow found it for me and I think she even sent it for free (or very cheap). It's weird what the right person with the right motivation can pull off on the right day.