Does anyone know what size bolt were used in the original external mirrors? I found a mirror to replace my cheap plastic/rubber mirrors but it only used one bolt which the previous owner had used a plastic anchor to make it fit....
thanks again.

I am pretty sure six mm. Two captive nuts inside the door skin. I hope the plastic anchor is in a hole covered by the mirror.

2 m6 countersunk but with a slight domehead

They are stainless steel. Same as the door screws. 914 rubber has them if you are already doing an order.

Thanks everyone! bought the bolt and pad and cuz the order was small I also bought interior carpeting. Getting closer to being a real car everyday.