I have used stems with a similar clamp and some bars can be a real PIA to get that stem around. What is the clamp diameter? It is probably 25.4 which will limit your bar choice somewhat.
The description says it has a 180 quill, that might be pretty tall for a MTB conversion.
Something like this might be worth checking out.
http://www.ebay.com/itm/BICYCLE-STEM...item460b10359c
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