When I gots my pcv re-route stuff in 2008 they only had vitron caps.
A couple years later when I bought the billet resonator, billet plugs was available and included as a kit.
My pounds of prevention was to remove the caps insert the billet plugs then clamp the vitron caps over them.
2007.5 GMC Sierra 3500 SRW L.B."BLACK" C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-Route
2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning