Wanted Stock Catalytic Converter and Heat Shield

I have an L82 78 Pace Car that is in stock condition except a few items. It has an aftermarket catalytic converter and heat shielding material. I am looking for the original AC Delco converter part number 6498393 and heat shield part number 357771.  I would also like the exhaust pipe heat shields that go in front of and in back of the converter. I think there part numbers are 356953 and 473040. 

As of this posting, I am still looking for the converter and the heat shield that was over the crossover pipes downstream of the converter. I understand the converter was the same from 1976 thru about 1980 and used on many GM cars during that period. Would appreciate any help in locating these parts.

I MAY have the heat shield. It's from a 75' if it'll work. 

Thanks for your reply. The heat shield I am looking for looks like this. 

No Sir. Doesn't look like what I have.