RD400 rear brake tension arm length

[ElFuegoBlanco]

After running into problems installing a chain with what turned out (thanks to the awesome people here) to be an extended swingarm, I went ahead, bit the bullet, and replaced it with a standard length swinger.

Now I'm left wondering if the brake tension bar is standard or not. Right away, I realized the caliper bracket would need to rotate to install the tension bar, which led me to this question. Will I need to replace the tension bar as well? The bar is 13 1/8" long. Is there anyone out there who can take a measurement of their RD400 tension bar? Or maybe someone can tell me if I even need to worry about it.

Thanks,
Rob