I have a 2006 Silverado with a 4.3, 2wheel drive, 5 speed. I stepped on the clutch today and it went to the floor. I seems as though the plastic master clutch cyl. snapped. I got a ride to the parts store and bought a new, metal one. I then removed the ele. switch from the shaft, installed it on the new part, and desconected the quick connect on the hyd. line. I then went to put the shaft through the fire wall. Thats when I realized that what really broke was the plug that is on the fire wall. It's a plug that has a square hole in it that the cyl. goes through and turns to lock in place. I called the local Chevy dealer but the parts guy couldn't find the part. Can anyone tell me the part number, or if I can get one at a NAPA type store? Thanks in advance, John.