Carbon Border Adjustments (CBAs) are becoming a critical instrument for addressing carbon leakage in unilateral climate policies. Yet implementing product-specific carbon pricing in computable general equilibrium models with input-output structures remains methodologically challenging. We develop a novel framework that integrates endogenous footprint accounting with price schedules dependent on embodied carbon, enabling analysis of CBAM design alternatives in GE models with flexible input-output structures. We apply the method to systematically compare three policy design margins for the EU-CBAM: (1) sector coverage (narrow CBAM sectors vs. all ETS sectors), (2) source broadness (direct emissions only vs. direct and indirect emissions), and (3) product-specificity (sector-aggregate vs. pro