Need help on correct linkage.. who makes it

I put this demon carb. (1901) on my 273 commando and works great but i cannot get the linkage right. have fabed different brackets, still not right, can't get it to open up all the way. tired of make-shift. do they make a bracket i can just but to make it correct? 1965 valiant conv. 273 commando. thanks

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