Wanted Gun Camera Spade grip fitting

Looking for a Gun camera bracket that fits the gun camera button to the MkIX Spit grip. Gas cannons are being made for our replca and we will use this button to fire them.
I dont mint if its original or repro, if anyone has one or can knock one up please let me know, thanks in advance.
For interest the gas cannons will be self contained in the cannon cowlings, this has several advantages, one they can be removed and the mecanism wont get damaged in transit or durring the fitting of the wings, also it makes them as loud as possible as the exhaust will be very short. We will have quick release hoses and cables supplying oxygen and electricity, we are hoping the butane supply will also fit in the cowlings.
I was given a demo of 50call gas gun and its really loud, the circuit board will give the cannon the correct rate of fire.
We hope to fit the 50calls as well at some stage but its not cheap so will probably be done after the next season.
If you want to see these Guns in action we will be at the war on the line event next summer.:)