Originally Posted by Ironfish653

Most threadless stems are able to be used as either +/- rise / drop. The Mutant isn't one of those, however. If you're not planning on using the bike for anything more than light-duty casual riding, you'll probably be OK, but it will look funny.

1" threadless is a bit of an odd duck, since it wasn't around very long, and hasn't been used in a long time. You can also use a 1-1/8" stem, with a reducing sleeve. It's pretty common, and would open up a lot more stem and bar options since 1-1/8" is pretty much universal now.