Fitting 1.5" tapered fork in a 42mm head tube? TL;DR: is there an IS42 bottom headset for a 1.5" tapered steerer tube?

I have a 2013 Giant Defy 3 road bike with a broken fork.  It's very hard to find used forks for this because the steerer tube needs to be 298mm long.  The inner diameter of the head tube is 42mm top and bottom and it has an integrated headset.  The original fork was 1.25" top and 1.25" bottom.  I found a good deal on a tapered carbon fork which is 1.25" top and 1.5" bottom.  Is there any headset bottom that will make this work?  All the IS42 headsets I have found are for 30mm bottom.
Crane Creek makes a headset that will solve this problem. I've used it on my MTB and it works well. It does slightly increase the stack height. 

Do I need a tapered head tube to use a tapered fork on my bike