New Door mirror mounting

[Justin71105]

How did you go about lining up to drill mirror holes for brand new doors. Will be using the stock style 3 hole mirrors from lmc.

The new doors do have the reinforcement but how are you figuringout where to drill holes from outside.

I though about cutting down a center punch and trying to push from inside to give me an idea. Tried looking for a template but came up empty handed so far.

Or putting a jnut on the bracker and threading in a bolt by hand til it touches the door skin. Tap it with a hammer from outside to get a small imprint, back off screw a turn or two and center punch from outside.