I'll answer my own question: AMD support staff answered incorrectly. The Wraith Spire is roughly 67 to 70mm. I measured it and then tried installing it in my Silverstone Raven RVZ02 case (which has a 65mm clearance in reality, 58 mm officially) and it failed to fit. The Wraith Spire is not a winning small form factor heatsink by any stretch of the imagination. So it looks like an ID-Cooling IS-60 in combination with a Delta 120 mm PWM fan is the way I will be going.Just to confirm, the Wraith Spire is 53.4 mm and not 70 mm as some here have initially suggested? I would be trying to fit this into a RVZ02.
EDIT: Actually, the RGB LED fixture pops right off the top, making it a perfect fit as advertised. It worked for me and I even switched the fan orientation with some long screws. See here where someone else performed all of this successfully:
https://www.reddit.com/r/Amd/comments/5zd5r9/removed_the_upper_part_of_the_wraith_spire_cooler/
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