When I did my man four wheel disk kit from BC I used long ush rod and a bullet shaped pill that I had to grind down to make fit just right. I've got an extra one I can get a pic of if needed.
hereis the pill I had to grind down, but that could depend on your MC I guess . The push rod is the 8 5/8 because I tried the 7" it would not work at all
This is a pic of a stock 4 wheel drum rod, the disk brake rods should be different but only in the length. Since your rid is incorrect you can weld a sleeve on one end and put some set screws on the other end. Once you have it correct weld it in place. The rods were often different if it had front disk, 4 wheel disk or 4 wheel drum. Some times the ball size can be different too. In that case you need the correct size one for your master. Hope that helps.
That looks like the rod I have. Thanks for the info guys. The conclusion I have made is there is no bolt on 4 wheel disc manual MC solution when it comes to push rod. It is gonna take some fab one way or the other.
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Nearly all rods like this are different, Some work when swapping out masters. The best way is to have several to chose from. Or you can make an adjustable one that you know will sit properly in the master. The master cyl will often have a dimple in the back where the rod sits. Some sit lower some just rest on the top. I honestly don't remember which rod I used in my swap. When I pull it down I will have to measure it.