They are still made... Moose makes them. I have one on my 200ES for the winter, i take it off for the summer. In the winter time when i am plowing its hard to get my big insulated boots under the shifter so i put it on for that.
Go to DennisKirk.com and search for Moose Hand Shifter and there will be quite a few different lengths to choose from. There is universal fit ones in 15, 20, 22 inches length. And there is some other application specific ones.
Also if you go to ebay and search for Moose Universal ATV Hand Shifter you will get tons to look at!
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....