From the photo the chain is Large Size Conveyor chain.
Please ask HRD to check with customer about below point
1) Chain pitch (P) , Roller Diameter ( R), Inner link plate width (W) , Plate thickness (T), Plate Height (H).
2) Application : what kind of material they convey.
3) What is the problem with the current chain?
4) The attachment (I the photo is welding attachment ) we have standard G2 which possible to use as well.
If we know the above points we can pre-select the chain for customer.
Then send the catalog page of chain to customer to confirm the dimension.
Prepare the quotation then visit customer to confirm specification & get order.