Not knowing what engine you are working on, the black suggestions are correct depending on yr for the later AMC engines. If you have a Kaiser era engine then, for example the 327 used a red air breather housing. It is always best to state yr and model when asking for assistance...the correct answer can vary considerably.
'82 J20, 360,TF727, NP 208, Holly Projection.'74 paint scheme
'67 Jeepster 8701,true convertible,TH400,pwr top,
'91 XJ, 4.0L,auto,Ramsey 8000,GC upcountry susp