I did a search and couldn't find an answer. One of the screws on the back of my 1800C speedometer broke and it is not called out on the OEM diagram. There are 2 of these screws that secure the speedo to the housing. The HDL drawing shows the grommet, washer and 5mm nut but not the screw itself. Anyone know if there is an available replacement part number? Thank you for any help.