Getting a Chinese car parts catalog can be judged with three sets of evidence: the VIN-to-model version mapping, the original part numbers and supersession relationships, and the exploded diagrams and order units. If any one is missing, hold off on further steps. The catalog must be searchable by VIN or model version and include original part numbers, supersession relationships, exploded diagrams and minimum order units. Keep the VIN-to-model version mapping and the original part numbers and supersession relationships on one versioned master sheet; when the exploded diagrams or order units change, update the record before signing.
For a deeper check, see What service documents should dealers request from a China car export partner?. The supply and warranty responsibility for a China car parts catalog must be written into the contract or service agreement; a supplier's verbal assurances are no substitute for a long-term commitment.