I installed the RadioRax in my C337A (and yes, STC applies) and love it. The avionics shop loved it as well when they went to install my GTN750 and GTX345. I had bought the spacers they sell for the installation, and it went pretty smooth. My advice would be - while the spacers work well, add another washer on each side to give just a little extra room. Avionics shop said it was tight for the GTN sliding in, and an extra 0.020" to 0.040" would have been nice.
Jeff
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