One Stone Arm Rest into GU Patrol

Today I have a crack at filming one of my first videos properly, I install a One Stone Arm Rest that is built for a 79 series but with some slight modifications they can be fitted to a GU Patrol.
Huge thanks to the guys at One Stone Arm Rests for providing such a high quality product and donating to charities with their profits.
Let me know if any changes and or tips and advice any help is appreciated.