I needed a new flywheel ring gear for my 1954 GMC water truck 302 engine. We used to get them at the local auto-parts. I was having trouble trying to locate it and one of the vintage parts houses mentioned Stove Bolt. While searching the forums I ran across your post. The Filling Station had the ring gear in stock. I converted the truck to 12 volts decades ago and was concerned I was getting the correct gear as there is a different part listed for 12 volt. The gentleman at The Filling Station knew off the top of his head that the 12 volt ring gear would be used in and after 1955 when the truck became 12 volt standard. The 139 tooth ring gear I had was correct for the application. Thank you for your help.