Purchased wrong Headset? (+ RB stem on MTB?)

rambino
rambino Posts: 45
edited December 2015 in MTB workshop & tech
I need a Zero Stack 44 (semi integrated) but the FSA Orbit Z I've just ordered states it's just 'integrated'

It's for a GT Avalanche 2.0:

Outer head tube diameter - 50mm
Inner diameter - 44mm
The inner ridge depth – 15mm

Head tube pic here

Another potential disaster is that I mistakenly ordered an FSA OS-115 Stem, which is road bike specific. Whilst it will fit my forks and FSA Afterburner Riser Handlebars, is there any reason why I should swap for a MTB specific stem?

Thanks

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