The S series firewall fitting has a 1 inch steel ball held in place by 2 stainless steel pressure plates. It has a swivel angle up to 50 degrees from straight and is held to the firewall with 6 #4 screws.
Assembly weighs only 1.0oz-1.9oz (.06lb-.12lb) depending on ball hole size.
Ball hole sizes available are .125, .188, .218, .240, .250, .260, .312, .330, .375, .438, .500, .562 and .750.
Meets FAR 23.1191 and AC 20-135 requirements.
Order example: TTP-125S (.125 ball hole size)
Yes, 05-01382 will secure an A920 outer housing.
I could not identify an A-760 cable, but if you are referring to an A-1760 cable, the best eyeball assembly to use is one with a 0.240" hole. There are several to choose from this size. You will just need to select the style of assembly you want and then the hole size 0.240".
You will need to drill a 1.125" diameter hole.