My CMP Zero has the H-9 P-47 retracts on it. At this time they are not setup to retract, just to supply gear for landing (Warbirds over Indiana coming up) that I needed quick. I tried them and found the fit very close. The retract side bolt heads hit on the sides of the wood blocks, so I cut groves for them and they dropped right in. I skipped the servo install and just wired the lever for "Always Down" operation. When I have more time I will decide if I want to cut and angle the H-9's forward or recut the wheel wells to the H-9 location. The stock ones are set up to angle forward and mine go straight down. I have not had any trouble with nose in's because of the lack of forward angle.

*** SIDE NOTE!!! ***
The H-9 retracts break after a few grass landings. They have a hole drilled into them for the cover mount and a crack starts there, then it slowly works it's way on around. This is due to flexing of the metal. I went to the LHS and bought steel sleaves a hair larger than the H-9 shafts and slid them over the exposed part of the landing gear covering the hole and reducing the flex on the area around the hole. So far I have gotten 3 times the landings with no breaking (I broke 2 sets of the stock/no mod ones) on both the zero and P-47. Not sure if this is a fix or just a bandaid to make it last a little longer. Jon