PSC Option A Short Schedule of Cost Components

I am using an ECC Option A contract and have been asked by the contractor what items they should insert into the Short Schedule of Cost Componeants in the Equipment Section as they don’t believe that the standard equipment lists like CECA have the appropriate list of equipment for the project. The question is can the Contractor create a seperate list of items with costs that they believe is more suitable for the work that is being carried out?