Hi Ramg66,
for the F3T/L/ST model & F3/RS/GS model, no need for template.. as our Wide Vu mirrors for these models come with a molded edges, that cup right into your OEM mirrors. All you need to do, clean your mirror, peel off the backing and stick it on.
Then press gently and hold it for a few seconds to ensure all the backing side are sticking.
For RT model, there is no molding, its flat to stick on to your OEM. The easiest way to do it for me:
-gently score the red adhesive protector sheet in the middle using exacto-knife. I think its easier to peel the backing from the center.
-peel off the backing.
-start from right to left, slowly aligning the edge of Wide vu mirror to OEM.. this way if you see they don't line up you can still adjust the wide vu mirror slightly. (up or down)
Let me know if you have questions.