A.
anwered by: canteau
You will need to replace the entire hub because there is not only an interface difference but also the hub shells are a different size to make a 7-speed hub with a shorter freehub body and an 8/9/10 speed hub with a longer freehub body both measure 135mm.
We would recommend the Deore T610 rear hub for rim brake compatible wheels that can be used with an 8/9/10 speed cassette.
http://www.treefortbikes.com/product/333222395231/1464/Shimano-Deore-T610-Rear.html