Bit of a warning, dont know how you are going to set up your elevators, but I purchased a SJ electronics Y Lead Servo Reverser, made in Korea for my Great planes Extra 300 these things seem new to the market so you may have them over there, the come in a red and black pack, well this so called reverser worked about 5 times then sent the servos into a frenzy, then failed to work at all, just imagine if this had happened in flight over a $1000 worth of aircraft without control, was going to get one for the Yak, but they can keep them.
Cheers
Greg