PAN-SH site of fatty acid synthase complex accepts
Malonyl - CoA 

Central thiol or Pan -SH or 4-phosphopantetheine of ACP →  Accepts malonyl group
Peripheral thiol or cysteine -SH group of 3-ketoacyl synthase  → Accepts acetyl group
Acetyl CoA
Malonyl CoA
Propionyl CoA
All