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We present postprocess AGB nucleosynthesis models with different$^{13}$C-pocket internal structures to better explain zirconium isotopemeasurements in mainstream presolar SiC grains by Nicolussi et al. (1997) andBarzyk et al. (2007). We show that higher-than-solar $^{92}$Zr/$^{94}$Zr ratioscan be predicted by adopting a $^{13}$C-pocket with a flat $^{13}$C profile,instead of the previous decreasing-with-depth $^{13}$C profile. The improvedagreement between grain data for zirconium isotopes and AGB models providesadditional support for a recent proposal of a flat $^{13}$C profile based onbarium isotopes in mainstream SiC grains by Liu et al. (2014).

The 13C-Pocket Structure in AGB Models: Constraints from Zirconium Isotope Abundances in Single Mainstream SiC Grains