Adam,
Let me know what measurements you're looking for.
I just replaced my stock '93 emblems with chrome ones from Jon B. I used masking tape to mark the area above the old emblems. Cleaned area with rubbing alcohol. Then just peeled the adhesive back portion leaving the emblems "stuck" and correctly postioned in the clear top portion. Postioned just below masking tape, rubbed in thoroughly, and it turned out perfect.
According to Jon B. you can use a hair dryer with dental floss to easily remove the old emblems and if desired - restick somewhere else - like inside the trunk.
ROCKET62