I have a MAF from an 04 Impala SS (L67) available, not sure about compatibility but PM me if interested. MAF was working fine, I just Gen V swapped last week and use an LQ4 style now.
I bought one off of reptile but if the price is right, i could take it off your hands
99 gtp- Burnt and gone
01 gtp- Here to stay-3.4, SD Headers, AL104's HAI, Overkill PCM, SD Hood