No
This is what you should get, and make sure your bike is either an (original spacing) 8 speed.
http://www.amazon.com/SRAM-X-7-Gripshift-Shifter-8-Speed/dp/B002E58Y9S/ref=cm_cr_pr_pb_t
http://www.sjscycles.co.uk/8-speed-sram-x7-rear-twist-shifter-prod14476/?geoc=au
http://www.utahtrikes.com/PROD-11618948.html
http://www.ebay.com/itm/SRAM-Shifters-X-7-X-7-Grip-Twist-Shifter-Set-X7-8-speed-/280533887954?pt=US_Shifters&hash=item41511f6bd2
If your bike is fitted with an 8 speed cassette, you are in luck, because an 8 speed system is much more tolerant of rear derailleur misalignment and is much less susceptible to ghost shifts from chain bounce.
Please be aware that the SRAM X7 Grip Shifter (otherwise known as a twist shift or twist shifter) is a 1:1 ratio mechanism, so your rear derailleur needs to be a 1:1 ratio mechanism.
The big advantage of a grip shifter operating the rear derailleur (installed on the left hand side of the handle bar) is that it allows you to operate both the grip shifter
"and" the front derailleur lever at the same time; by rolling your left hand (thereby twisting the shifter) and using your left thumb to flick back the front derailleur lever. The same is true if you need to go from low range to high range, but you just push the lever forward.
It might not sound like something of great importance, but lets say you are in high range 3rd gear and suddenly need to drop into low range 1st gear, you can operate both the front derailleur and the rear derailleur at the same time; using just your left hand, whilst simultaneously modulating the throttle tube and front brake lever with your right hand (using a dual pull brake lever).
The ergonomics of the handlebar control mechanisms do not get any more perfect than that !!!
If you scroll to 1:10 on the video you can see how the ergonomics are set up, with one hand being able to operate the grip shift and front derailleur lever and horn and clutch lever; without having to take your hand off the handlebar.