I just had a good look around for it, even using internet archive and wayback machine, but to no avail. It may not be online. I am still searching, as I have to return you a favour for the Spinball Whizzer audio you gave me.
I'm sure it will be on one of the many recordings of The Simpsons that are on our old Sky+ box at my parents' house. I can always remember seeing it advertised after the all stars racing game. when I was watching The Simpsons.
It's a shame the wayback machine doesn't have it. Hopefully 2020 will be the year someone records the full 25 minute soundtrack for SPW now, and the year that we find the sonic spinball advert!