mirror ?

I have a 68 mustang coupe with a built 302, but I have a problem as Im finishing up going through little things I find that my OEM ford side mirror for the driver side door is about an inch short of fitting in the holes that are in the door So the way I see it I have a couple options find a mirror that has a longer base. Does anybody know of one from a different model the stock 67-68 from mounting hole to mounting hole measures 6inches I need 7''. Or i can redrill the door and mount the mirror I have and live with extra hole until I get around to fixing the door. Any input. Thanks

yes my mirror has a hole spacing of 6 inches but the previous owner, or someone drilled holes at 7inches in the door. I don't know what i should do about it at the moment.