vacuum amplifier-'73 dart sport../6

I believe it is called a vacuum amplifier, but not 100% certain..but there is a "manifold" where all the vacuum hoses terminate, attached to this device. I have tried a few auto parts places to no avail. I am looking for just the "hose harness" portion of this,( but have a feeling I'll have to buy it as a complete unit) as the one I have is brittle and cracked/broken . Temporarily used larger hoses and clamps to couple the broken vacuum hoses, but would like to replace it.

any suggestions on what its called, or hopefully, actual part name /number would be appreciated.

if my description is lousy, I can post a picture of it-it is located on top of the engine, about midway along the rocker cover where all the vacuum lines converge.

thanks

Dave