Hello; I purchased a used gas cooktop and want to convert it to propane... this is a STERLING cooktop... manufactured by NEW WORLD DOMESTIC APPLIANCE(they were no help)... serial-DOA299... label part-0522-11-900... tried to get a kit from manufacturer but they were no help... need a universal kit or something... maybe a step by step... please help

Usually the company you will,but your propane from will offer a service to conver it over. Trying to find the necessary orifices for that unit will be almost impossible to do unless you actually work on them like the propane company does.