I assume you're talking about some kind of plugs to make it look pretty?
I got some here to fill my engine bay holes after hiding my wires: http://www.widgetco.com/
Had good luck with their products.
2000 T/A Pacesetter LTs, Pacesetter ORY, TSP Rumbler, Corsa Clones, LS6 Intake Manifold, FAST TB, Smooth Bellows, MTI Clear Air Lid, Dyno Tune, Shock tower Brace, !AIR, !EGR, K&N, Free Ram Air, UMI Torque Arm, UMI Poly/Poly LCAs, UMI LCA Relocation brackets, Nitto 555rs, Motive 3.73s 336.4 RWHP 333.4 Tq
2002 Silverado 4x4 fun
2007 G6 Daily driver