I'm tryig to get my Wilwoods buttoned up...

I just ordered the exact same set up for my 69 dart,should be here thurs and going in saturday.
The only thing I didn't get(they didn't say I needed it)
was the
adjustable brake push rod
or
Residual valve with fittings !

Is this a "must" before I start to install I want to make sure all will go right.
Thanks,Tim