You want nice small mirror, but I don't recommend putting them right against your truck for obvious reasons:
1.) You will not have good visibility.
2.) You may possibly effect the attached flow of the vehicle.
You want the mirror to protrude about 6" (past attached flow in most cases). Maybe do a tuft test to see. Since your truck is not a race car, there may be turbulent air flowing past the mirror,in that case it would be better to put a small mirror really close to the truck, but then again you run into the visibility issue.
If you make a nice mold, don't forget to make it it reproducable!
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