Konica Repair Question

I recently got a Konica Autoreflex A1000 body. Based on the code on the foil sticker, it was made 50 years ago this month. The shutter fires and the meter is working. I have 675 zinc-air hearing aid batteries in it. The frame counter is not working. It is missing one of the screws which hold the lens mount on. I found a mount and surround, with screws from an Autoreflex A on the auction site. For reference, the auction # is 173907131850. It came with screws and washers. I don't know whether I should use one of the black washers or one of the silver ones. The film chamber is very clean and the pressure plate shows no marks. I don't think very much film ran through the camera. There is a roll of test film in it now to check for light tightness. I will try to tackle the seals and mirror foam myself.