Spotter bars (Bontrager SSR VR-C 26.0) are about 95mm reach and 31.8 version (Race VR-C) are 100mm -> http://www.bontrager.com/model/09169
The shop link on that site says they are 85mm reach, as are any other shop sites I can find them on. Oh, and they are discontinued.
@svenhöek started
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Spotter bars (Bontrager SSR VR-C 26.0) are about 95mm reach
and 31.8 version (Race VR-C) are 100mm -> http://www.bontrager.com/model/09169