I'm not familiar with the extenders, but my right side stock peg bracket is a bit bent as well. The right stock peg always felt bent, but I knew it was chewed up a bit, so I thought it might have been uneven wear on the rubber. I just swapped out for wider all metal foot pegs, and the right is definitely bent down.
I'm probably going to find some cheap replacement brackets on ebay and keep then in my garage and eventually swap them out.
2002 DL1000: 75k miles. Bought at 50k miles.
1992 XJ600: Red, Very custom.
2002 Vespa ET4 150: The wife's ride.