Yep, just use those ERA measurements. They are the correct ones for tapered.
A lot of Cobra's around here have non-tapered stripes. Actually non-tapered out number tapered stripes by a fair margin. The casual observer would not notice the difference.
Don't just use those measurements blindly though. Do what you like. For example you could make the stripe narrower where it goes through the
oil cooler intake hole. So that the stripes runs inside the hole, not outside of it. My stripes will be 135mm each with 25mm gap in the
oil cooler hole. Certainly the look I'm going for.