Short reply, no. Last I checked, for reasons I can't grasp Rivco sells the extenders separately, but the only way you can use them is to buy the floorboards which come with the spacers needed to use the extenders! By now the spacers may be available separately at extra cost. After buying extenders and spacers if memory serves you'll then have to drill out the hole in the extender to fit the diameter of the stock peg because for reasons I again can't grasp Rivco doesn't use the same size threads for the floorboard mounts that the stock peg has. After having done all that you'll then have to cut some of the length off the peg's stud because it is then too long to clear the chrome cover.
I have a set of the extenders (unused) around here somewhere...
It's a shame someone hasn't come up with more solutions to this problem as even a 5'4" passenger complains of the pegs being too close. It can also be very hard to avoid the dreaded boot melt with the exhaust so close behind the pegs.
The good news is, if you do buy the whole Rivco setup the people here rave about the quality of what they sell.