Hi all -
Many thanks for the great responses. I really need help in determining the correct factory screws that were used to attach the bracket to the clock housing. From the attached GM Floor Mounted Clock Instruction Sheet it's a 10-16 x 5/8" screw, but it doesn't indicate if it's a machine, sheetmetal, hex washer, oval, pan or flat screw and the diameter, such as .36D, .37D, .40D, or .44 Flat. If anyone can help with the type of screw used/diameter or even better a GM part number that would be fantastic. gwp4.