I think I got the shaft here

The wrong torque shaft that is. I was thinking ahead and trying to get all the pieces I am going to need to put the 4 speed in and was looking on Brewers website getting ready to buy the frame ball stud bracket and starter shield and ran across the z bar on there. I was reading the description of it ( TS238 ) and it mentioned a 7" tube length for it. I measured mine out of curiosity and it measures 8". Is the TS238 that's on Brewers site the right one for my application (73 Dart Sport), 360/833 and if so what does this one fit with an 8 " tube. I am too trusting and the fact that when I bought all these parts from the guy in Detroit along with the tranny, I had no idea what to look for. All I saw was a bunch of parts I needed not necessarily the right ones. So does anybody know what this z bar fits. I may have to sell it and get the right one. pics below. has 8" tube length. one arm is about 4 5/8 " long and the other one is about 4 1/4" long. Bill