Join Date: Oct 2007
Location: Québec, Québec, Canada
Bikes: Fuji Touring 64cm, Peugeot Canada PB-18 61cm and winter beaters
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All gripshifts that I know of are designed to fit MTB-diameter (22.2mm) handlebars, which includes flat bars, riser bars, trekking bars, north road bars... So, all gripshifts will physically fit on your handlebars.
While the left (front derailleur) gripshift can be of any type, the right (rear derailleur) has to be of Shimano 8-speed type.
The rear SRAM shifter you linked to will **NOT**
work, because it is of the 1:1 actuation ratio type. In the "compatiblity" section, it says: "SRAM 1:1 9 or 8-speed rear derailleurs". You do not have such a rear derailleur. Do not purchase these gripshifters.
What you need is a Shimano-compatible (2:1 actuation ratio) rear shifter. Like this
As I said, the front (left) shifter doesn't matter, it's all compatible.