Here is a custom 30.5mmx30.5mm adapter for Furious FPV-0121-S FrSky.
It is printed in TPU Ultimaker 95A (ninjatek) to protect the receiver from vibration and shock.
A version with and without buzzer
Mini receiver furious:
http : //www.banggood.com/5V-Buzzer-Alarm-Beeper-With-Cable-for-Eachine-QX70-QX90-QX95-NAZE32-F3-DIY-Micro-Brushed-FPV-Racer-p-1100338.html ? P = LD020411878172015024
TPU 235 ° / 75 ° / 50 mm / s max