Export against ct-1

Hello

We export under UT-1 (Letter of undertaking) as well against CT-1(to Mercahnt Exporter)

• Sales against CT-1 (to Merchant exporter who issue us CT-1 & ARE1)

While we prepare the ARE1- there is format like To Superintendent of Central Excise.(full postal address) & blank place is there.

I want to know which address i shoud write over there- our Supdt. Excise addresss or buyer's Supdt.Excise address??

I need to submit its 3rd/4th/5th copy of ARE1 in our Excise dept.& after their signature on it i need to submit the same to buyer.

so which address i should write there?  

PLease advise.

thanks