TowHunter Gillig Bus Forks. Sold individually. Often referred to as Gillis Bus Forks. These Gillig Bus Forks are manufactured by Pete Soro Machine Works and is called the Gillis Bus Fork. Easily hook up to a city bus with this Heavy-Duty Wrecker Attachment. These Bus Forks fit in Miller Industries fork receivers. The top part of the fork fits into the holes in the Gillig bus frame, and measures 1 3/8" diameter.