Customs duty reimb will not attract TDS. The same is not a remuneration for services rendered. It is only a reimb. Clearing agent pays by one hand and seeks reimb. Customs duty is not payable by clearing agent for his clearing activities. He is paying this on behalf of principal only.
In the case of 194 I (rent) , service tax liability exists on the service provider, on which no TDS is required, as per specific exemption. Correct comparison will be a repair job on which service tax is also charged by contractor. Here on the total bill value (incl service tax), TDS is recoverable u/s 194C.