What form should be used by safety and emission stations with GVIP analyzers when ordering inspection authorities or decals?

Answer: C — Form SHP-453

The correct choice for the form that safety and emission stations with GVIP analyzers should use when ordering inspection authorities or decals is indeed Form SHP-453. This form is specifically designed for the purpose of requesting the necessary inspection authorities or decals needed for vehicles undergoing safety and emission inspections. Using the correct form ensures that the inspection stations comply with state regulations and can effectively manage their inventory of inspection decals, which are essential for the proper operation of emission testing. This helps maintain the integrity of the inspection process and ensures that all vehicles tested meet the necessary safety and environmental standards set by the state of Missouri. The other forms listed are associated with different purposes and procedures not related to ordering inspection authorities or decals, which is why they would not be suitable for this scenario.