My Retrofit
Gonna have like 5 or 6 H emblem die cut stickers made.
Dimensions are to be 0.625" wide and 0.521" in height. The lens is 2.5" in diameter so I think that'll show up enough without being too obvious. The width is 1/4 the diameter of the lens and the height is the width divided by 1.2, this will keep an accurate ratio to imitate the real emblem... Sounds like a good size to me.
Edit: Just emailed the guy, so we'll see.