DiMarzio Billy Corgan Strat Replacement Loaded pickguard – white (BC-1 / The Chopper / BC-2). DiMarzio Billy Corgan Strat Replacement Loaded pickguard – white. As a result of the feedback we got from Billy Corgan while working on the sound of his custom Strat®, we modified the Air Norton® S (neck) and the Tone Zone® S (bridge) for a deeper sound from the low strings with no loss of punch, and a cleaner sound with high-gain amps. Recommended For: Standard US Strats & similar SSS guitars. Year of Introduction: 2010. Resistance: 11.62 Kohm. Resistance: 13.47 Kohm. Resistance: 9.16 Kohm.