Take a pencil (or crayon) rubbing of the lettering so you have an accurate measurement of the spacing. Also take a moment to measure from the edges of the letters to two body lines, like on the door, measure from the body line betwen the fender and door to the front edge of the letters, and measure down to the upper edge of the lower cladding from the bottom of the letters. This way you can lay out a couple lines with blue tape later on and put them in exactly the stock location if need be, in case a buyer wants them back on for whatever reason (not that I'd worry too much about it, but it's cheap insurance incase you need the info later). Keep the measurements and pencil rubbings folded up in the bag you store the emblems in.