I am afraid there is no way around the fact that you just have to wait for it to show up in the UCD, online dealership, a 2003 ticket or a 1000 ticket (?).
Get the 2003 ticket, back up your save file to a flash drive, use the 2003 ticket. If you don't get the Speed 8, restore your save file and try again. This is how I got my Speed 8 (and many others). For the Speed 8 it took me only three tries, but I got VERY lucky.