hugger69z28rs,
Sorry for my delayed response; I have not been on CRG for a while.
I am not sure why you are not getting a response back from Eric Gardner. I have been communicating with Eric over the phone and email over the past 2-months. I just received my Gardner exhaust resonator system yesterday. It took about 5 - 6 weeks after he took my order once I confirmed exactly what I wanted. I sent him a certified check via UPS (unfortunately, I cannot trust my local Post Office anymore). I do know he has been out of the office on personal travel lately.
For my 05A Norwood build '69 Z28, I followed William's advise: "If you're looking for approximate VINs, I'd estimate N627600/L52900 for the resonator system, and N646229/L530160 for chrome tail pipes." My VIN is N638712 so I ordered the resonator system with aluminized tail pipes. Eric will build what you want but will also recommend the appropriate system for your car based on the build date and his person experience and research.
I ordered the "Concours Show Package" costing an additional $200 which includes Zink plated clamps and exhaust hangers. Gardner has done an outstanding job duplicating the original style clamps and hangers down to the rivets that retain the rubber to the metal hanger. The stud kit ($24.00) includes the correct exhaust manifold studs and nuts. The exhaust "head pipes" that connect to the exhaust manifold include the special extension pipe item #3 and packing (gasket) item #4 shown in the Assembly Manual under the N10 Duel Exhaust option.
Overall, I am very happy with Gardner Exhaust! Now I need time to remove my 27+ year old exhaust and replace it with this new system!