I found these on eBay today. Only shifter extensions I have seen so far.epper:
http://www.ebay.com/itm/271971536688
http://www.ebay.com/itm/271971536688
Love them, could never go back to just the plastic paddles now haha
I do not remember the brand of tape but try to go as thin as possible, I had some thicker tape and they were on there pretty well but not 100% perfect. I put in three pieces, all three horizontal, one longer piece for the bottom and then two going up, they do hold on good and feel solid but they can be taken off with enough force. I had to take them off when I got my 350 wheel though since the extensions will block the holes needed to take the wheel off. Once you get them mounted via the tape they will not come off easily though unless you forcibly grab the tip top portion of the paddle.
Thanks for the info, I'll definitely look for thin D-S-T.
Bump and update. Still trying to find some good double sided tape, I have tried a few so far but the tape is either too thin or does not stick to the plastic paddle (though it sticks to the metal just fine).
Also as husker mentioned they have the same ones on CJPP along with carbon fiber, I think they were on sale recently. Might try the carbon fiber paddles out for the fun of it.